diff --git a/.changeset/eleven-sloths-boil.md b/.changeset/eleven-sloths-boil.md
new file mode 100644
index 000000000..2855e0e86
--- /dev/null
+++ b/.changeset/eleven-sloths-boil.md
@@ -0,0 +1,5 @@
+---
+"@kubb/plugin-oas": patch
+---
+
+remove duplicated keys when using `allOf` and applying required on fields
diff --git a/docs/changelog.md b/docs/changelog.md
index 0e9d1b135..d473bd8f6 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -6,6 +6,7 @@ title: Changelog
 
 ## 3.5.2
 - [`plugin-faker`](/plugins/plugin-faker): `faker.number.float` with default min `Number.MIN_VALUE` and max set to `Number.MAX_VALUE`.
+- [`plugin-oas`](/plugins/plugin-oas): remove duplicated keys when using `allOf` and applying required on fields
 
 ## 3.5.1
 - [`core`](/plugins/core): build of `@kubb/core` with correct types
diff --git a/examples/typescript/package.json b/examples/typescript/package.json
index 585aedf80..8d94ea504 100644
--- a/examples/typescript/package.json
+++ b/examples/typescript/package.json
@@ -15,6 +15,7 @@
     "build": "tsup",
     "clean": "npx rimraf ./dist",
     "generate": "kubb generate",
+    "generate:debug": "NODE_OPTIONS='--inspect-brk' kubb generate",
     "start": "tsup --watch",
     "test": "vitest",
     "typecheck": "tsc -p ./tsconfig.json --noEmit --emitDeclarationOnly false"
diff --git a/examples/typescript/petStore.yaml b/examples/typescript/petStore.yaml
index fab92fa99..5a896a2d5 100644
--- a/examples/typescript/petStore.yaml
+++ b/examples/typescript/petStore.yaml
@@ -689,9 +689,10 @@ components:
     Address:
       type: object
       properties:
-        street:
+        streetName:
+          type: string
+        streetNumber:
           type: string
-          example: 437 Lytton
         city:
           type: string
           example: Palo Alto
@@ -832,6 +833,15 @@ components:
           readOnly: true
         bark:
           type: string
+    FullAddress:
+      properties:
+        streetName:
+          type: string
+      allOf:
+        - $ref: "#/components/schemas/Address"
+      required:
+        - streetName
+        - streetNumber
     AddPetRequest:
       required:
         - name
diff --git a/examples/typescript/src/gen/index.ts b/examples/typescript/src/gen/index.ts
index 550a14efe..22c761b9f 100644
--- a/examples/typescript/src/gen/index.ts
+++ b/examples/typescript/src/gen/index.ts
@@ -32,6 +32,7 @@ export type {
   FindPetsByTagsQueryResponse,
   FindPetsByTagsQuery,
 } from './ts/models/FindPetsByTags.ts'
+export type { FullAddress } from './ts/models/FullAddress.ts'
 export type { GetInventory200, GetInventoryQueryResponse, GetInventoryQuery } from './ts/models/GetInventory.ts'
 export type {
   GetOrderByIdPathParams,
diff --git a/examples/typescript/src/gen/models.ts b/examples/typescript/src/gen/models.ts
index 37bd9ba8e..5e1c64ac9 100644
--- a/examples/typescript/src/gen/models.ts
+++ b/examples/typescript/src/gen/models.ts
@@ -62,7 +62,11 @@ export interface Address {
   /**
    * @type string | undefined
    */
-  street?: string
+  streetName?: string
+  /**
+   * @type string | undefined
+   */
+  streetNumber?: string
   /**
    * @type string | undefined
    */
@@ -240,6 +244,18 @@ export interface Dog {
   bark?: string
 }
 
+export type FullAddress = Address & {
+  /**
+   * @type string
+   */
+  streetNumber: string
+} & {
+  /**
+   * @type string
+   */
+  streetName: string
+}
+
 export enum AddPetRequestStatusEnum {
   available = 'available',
   pending = 'pending',
diff --git a/examples/typescript/src/gen/modelsConst.ts b/examples/typescript/src/gen/modelsConst.ts
index 64785306c..305834860 100644
--- a/examples/typescript/src/gen/modelsConst.ts
+++ b/examples/typescript/src/gen/modelsConst.ts
@@ -66,7 +66,11 @@ export type Address = {
   /**
    * @type string | undefined
    */
-  street?: string
+  streetName?: string
+  /**
+   * @type string | undefined
+   */
+  streetNumber?: string
   /**
    * @type string | undefined
    */
@@ -252,6 +256,18 @@ export type Dog = {
   bark?: string
 }
 
+export type FullAddress = Address & {
+  /**
+   * @type string
+   */
+  streetNumber: string
+} & {
+  /**
+   * @type string
+   */
+  streetName: string
+}
+
 export const addPetRequestStatusEnum = {
   available: 'available',
   pending: 'pending',
diff --git a/examples/typescript/src/gen/modelsConstEnum.ts b/examples/typescript/src/gen/modelsConstEnum.ts
index 94b3c4ada..3abbd4d83 100644
--- a/examples/typescript/src/gen/modelsConstEnum.ts
+++ b/examples/typescript/src/gen/modelsConstEnum.ts
@@ -62,7 +62,11 @@ export type Address = {
   /**
    * @type string | undefined
    */
-  street?: string
+  streetName?: string
+  /**
+   * @type string | undefined
+   */
+  streetNumber?: string
   /**
    * @type string | undefined
    */
@@ -240,6 +244,18 @@ export type Dog = {
   bark?: string
 }
 
+export type FullAddress = Address & {
+  /**
+   * @type string
+   */
+  streetNumber: string
+} & {
+  /**
+   * @type string
+   */
+  streetName: string
+}
+
 export enum AddPetRequestStatusEnum {
   available = 'available',
   pending = 'pending',
diff --git a/examples/typescript/src/gen/modelsLiteral.ts b/examples/typescript/src/gen/modelsLiteral.ts
index 4b2ab5ed7..6e64c9cfb 100644
--- a/examples/typescript/src/gen/modelsLiteral.ts
+++ b/examples/typescript/src/gen/modelsLiteral.ts
@@ -54,7 +54,11 @@ export type Address = {
   /**
    * @type string | undefined
    */
-  street?: string
+  streetName?: string
+  /**
+   * @type string | undefined
+   */
+  streetNumber?: string
   /**
    * @type string | undefined
    */
@@ -221,6 +225,18 @@ export type Dog = {
   bark?: string
 }
 
+export type FullAddress = Address & {
+  /**
+   * @type string
+   */
+  streetNumber: string
+} & {
+  /**
+   * @type string
+   */
+  streetName: string
+}
+
 export type AddPetRequestStatusEnum = 'available' | 'pending' | 'sold'
 
 export type AddPetRequest = {
diff --git a/examples/typescript/src/gen/modelsPascalConst.ts b/examples/typescript/src/gen/modelsPascalConst.ts
index 64785306c..305834860 100644
--- a/examples/typescript/src/gen/modelsPascalConst.ts
+++ b/examples/typescript/src/gen/modelsPascalConst.ts
@@ -66,7 +66,11 @@ export type Address = {
   /**
    * @type string | undefined
    */
-  street?: string
+  streetName?: string
+  /**
+   * @type string | undefined
+   */
+  streetNumber?: string
   /**
    * @type string | undefined
    */
@@ -252,6 +256,18 @@ export type Dog = {
   bark?: string
 }
 
+export type FullAddress = Address & {
+  /**
+   * @type string
+   */
+  streetNumber: string
+} & {
+  /**
+   * @type string
+   */
+  streetName: string
+}
+
 export const addPetRequestStatusEnum = {
   available: 'available',
   pending: 'pending',
diff --git a/examples/typescript/src/gen/schemas/Address.json b/examples/typescript/src/gen/schemas/Address.json
index 21f73590a..a6a0e8f07 100644
--- a/examples/typescript/src/gen/schemas/Address.json
+++ b/examples/typescript/src/gen/schemas/Address.json
@@ -1,7 +1,8 @@
 {
   "type": "object",
   "properties": {
-    "street": { "type": "string", "example": "437 Lytton" },
+    "streetName": { "type": "string" },
+    "streetNumber": { "type": "string" },
     "city": { "type": "string", "example": "Palo Alto" },
     "state": { "type": "string", "example": "CA" },
     "zip": { "type": "string", "example": "94301" }
diff --git a/examples/typescript/src/gen/schemas/Customer.json b/examples/typescript/src/gen/schemas/Customer.json
index 854aa64af..b8288a0d9 100644
--- a/examples/typescript/src/gen/schemas/Customer.json
+++ b/examples/typescript/src/gen/schemas/Customer.json
@@ -9,7 +9,8 @@
       "items": {
         "type": "object",
         "properties": {
-          "street": { "type": "string", "example": "437 Lytton" },
+          "streetName": { "type": "string" },
+          "streetNumber": { "type": "string" },
           "city": { "type": "string", "example": "Palo Alto" },
           "state": { "type": "string", "example": "CA" },
           "zip": { "type": "string", "example": "94301" }
diff --git a/examples/typescript/src/gen/schemas/fullAddress.json b/examples/typescript/src/gen/schemas/fullAddress.json
new file mode 100644
index 000000000..82623a733
--- /dev/null
+++ b/examples/typescript/src/gen/schemas/fullAddress.json
@@ -0,0 +1,19 @@
+{
+  "properties": { "streetName": { "type": "string" } },
+  "allOf": [
+    {
+      "type": "object",
+      "properties": {
+        "streetName": { "type": "string" },
+        "streetNumber": { "type": "string" },
+        "city": { "type": "string", "example": "Palo Alto" },
+        "state": { "type": "string", "example": "CA" },
+        "zip": { "type": "string", "example": "94301" }
+      },
+      "xml": { "name": "address" },
+      "x-readme-ref-name": "Address"
+    }
+  ],
+  "required": ["streetName", "streetNumber"],
+  "x-readme-ref-name": "FullAddress"
+}
diff --git a/examples/typescript/src/gen/ts/models/Address.ts b/examples/typescript/src/gen/ts/models/Address.ts
index eb578826d..644b504c2 100644
--- a/examples/typescript/src/gen/ts/models/Address.ts
+++ b/examples/typescript/src/gen/ts/models/Address.ts
@@ -2,7 +2,11 @@ export type Address = {
   /**
    * @type string | undefined
    */
-  street?: string
+  streetName?: string
+  /**
+   * @type string | undefined
+   */
+  streetNumber?: string
   /**
    * @type string | undefined
    */
diff --git a/examples/typescript/src/gen/ts/models/FullAddress.ts b/examples/typescript/src/gen/ts/models/FullAddress.ts
new file mode 100644
index 000000000..779041fda
--- /dev/null
+++ b/examples/typescript/src/gen/ts/models/FullAddress.ts
@@ -0,0 +1,13 @@
+import type { Address } from './Address.ts'
+
+export type FullAddress = Address & {
+  /**
+   * @type string
+   */
+  streetNumber: string
+} & {
+  /**
+   * @type string
+   */
+  streetName: string
+}
diff --git a/examples/typescript/src/gen/ts/models/index.ts b/examples/typescript/src/gen/ts/models/index.ts
index 85b9da672..8443fdad1 100644
--- a/examples/typescript/src/gen/ts/models/index.ts
+++ b/examples/typescript/src/gen/ts/models/index.ts
@@ -26,6 +26,7 @@ export type {
   FindPetsByStatusQuery,
 } from './FindPetsByStatus.ts'
 export type { FindPetsByTagsQueryParams, FindPetsByTags200, FindPetsByTags400, FindPetsByTagsQueryResponse, FindPetsByTagsQuery } from './FindPetsByTags.ts'
+export type { FullAddress } from './FullAddress.ts'
 export type { GetInventory200, GetInventoryQueryResponse, GetInventoryQuery } from './GetInventory.ts'
 export type { GetOrderByIdPathParams, GetOrderById200, GetOrderById400, GetOrderById404, GetOrderByIdQueryResponse, GetOrderByIdQuery } from './GetOrderById.ts'
 export type { GetPetByIdPathParams, GetPetById200, GetPetById400, GetPetById404, GetPetByIdQueryResponse, GetPetByIdQuery } from './GetPetById.ts'
diff --git a/examples/typescript/src/gen/ts/models/oas.ts b/examples/typescript/src/gen/ts/models/oas.ts
index 2597ac83a..2d592694f 100644
--- a/examples/typescript/src/gen/ts/models/oas.ts
+++ b/examples/typescript/src/gen/ts/models/oas.ts
@@ -1004,9 +1004,11 @@ export const oas = {
       Address: {
         type: 'object',
         properties: {
-          street: {
+          streetName: {
+            type: 'string',
+          },
+          streetNumber: {
             type: 'string',
-            example: '437 Lytton',
           },
           city: {
             type: 'string',
@@ -1199,6 +1201,19 @@ export const oas = {
         },
         required: ['type'],
       },
+      FullAddress: {
+        properties: {
+          streetName: {
+            type: 'string',
+          },
+        },
+        allOf: [
+          {
+            $ref: '#/components/schemas/Address',
+          },
+        ],
+        required: ['streetName', 'streetNumber'],
+      },
       AddPetRequest: {
         required: ['name', 'photoUrls'],
         type: 'object',
diff --git a/packages/plugin-oas/src/SchemaGenerator.ts b/packages/plugin-oas/src/SchemaGenerator.ts
index f58b7661f..895da0f56 100644
--- a/packages/plugin-oas/src/SchemaGenerator.ts
+++ b/packages/plugin-oas/src/SchemaGenerator.ts
@@ -564,10 +564,15 @@ export class SchemaGenerator<
           .filter(Boolean)
 
         const items = schemaWithoutAllOf.required
-          .filter((key) =>
+          .filter((key) => {
             // filter out keys that are already part of the properties(reduce duplicated keys(https://github.com/kubb-labs/kubb/issues/1492)
-            schemaWithoutAllOf.properties ? !Object.keys(schemaWithoutAllOf.properties).includes(key) : false,
-          )
+            if (schemaWithoutAllOf.properties) {
+              return !Object.keys(schemaWithoutAllOf.properties).includes(key)
+            }
+
+            // schema should include required fields when necessary https://github.com/kubb-labs/kubb/issues/1522
+            return true
+          })
           .map((key) => {
             const schema = schemas.find((item) => item.properties && Object.keys(item.properties).find((propertyKey) => propertyKey === key))
 
diff --git a/packages/plugin-oas/src/__snapshots__/SchemaGenerator.test.ts.snap b/packages/plugin-oas/src/__snapshots__/SchemaGenerator.test.ts.snap
index ea64b74bf..66d4bc9f7 100644
--- a/packages/plugin-oas/src/__snapshots__/SchemaGenerator.test.ts.snap
+++ b/packages/plugin-oas/src/__snapshots__/SchemaGenerator.test.ts.snap
@@ -12,6 +12,68 @@ exports[`SchemaGenerator core > 'FullAddress' 1`] = `
         },
         "keyword": "ref",
       },
+      {
+        "args": {
+          "additionalProperties": [],
+          "properties": {
+            "streetName": [
+              {
+                "keyword": "string",
+              },
+              {
+                "args": {
+                  "format": undefined,
+                  "type": "string",
+                },
+                "keyword": "schema",
+              },
+              {
+                "args": "streetName",
+                "keyword": "name",
+              },
+            ],
+          },
+        },
+        "keyword": "object",
+      },
+      {
+        "args": {
+          "format": undefined,
+          "type": "object",
+        },
+        "keyword": "schema",
+      },
+      {
+        "args": {
+          "additionalProperties": [],
+          "properties": {
+            "streetNumber": [
+              {
+                "keyword": "string",
+              },
+              {
+                "args": {
+                  "format": undefined,
+                  "type": "string",
+                },
+                "keyword": "schema",
+              },
+              {
+                "args": "streetNumber",
+                "keyword": "name",
+              },
+            ],
+          },
+        },
+        "keyword": "object",
+      },
+      {
+        "args": {
+          "format": undefined,
+          "type": "object",
+        },
+        "keyword": "schema",
+      },
     ],
     "keyword": "and",
   },