diff --git a/changelog/@unreleased/pr-2421.v2.yml b/changelog/@unreleased/pr-2421.v2.yml
new file mode 100644
index 000000000..74f85be0e
--- /dev/null
+++ b/changelog/@unreleased/pr-2421.v2.yml
@@ -0,0 +1,5 @@
+type: improvement
+improvement:
+  description: 'remove bounds check on input ''long'' values into ''alias: double'''
+  links:
+  - https://github.com/palantir/conjure-java/pull/2421
diff --git a/conjure-java-core/src/integrationInput/java/com/palantir/product/AliasedDouble.java b/conjure-java-core/src/integrationInput/java/com/palantir/product/AliasedDouble.java
index ce7dd6395..422c64784 100644
--- a/conjure-java-core/src/integrationInput/java/com/palantir/product/AliasedDouble.java
+++ b/conjure-java-core/src/integrationInput/java/com/palantir/product/AliasedDouble.java
@@ -2,7 +2,6 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
-import com.palantir.conjure.java.lib.SafeLong;
 import java.math.BigDecimal;
 import javax.annotation.Nullable;
 import javax.annotation.processing.Generated;
@@ -55,8 +54,7 @@ public static AliasedDouble of(double value) {
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
     public static AliasedDouble of(long value) {
-        long safeValue = SafeLong.of(value).longValue();
-        return new AliasedDouble((double) safeValue);
+        return new AliasedDouble((double) value);
     }
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
diff --git a/conjure-java-core/src/integrationInput/java/com/palantir/product/DoubleAliasExample.java b/conjure-java-core/src/integrationInput/java/com/palantir/product/DoubleAliasExample.java
index b4f4bda83..c5fe9d5dd 100644
--- a/conjure-java-core/src/integrationInput/java/com/palantir/product/DoubleAliasExample.java
+++ b/conjure-java-core/src/integrationInput/java/com/palantir/product/DoubleAliasExample.java
@@ -2,7 +2,6 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
-import com.palantir.conjure.java.lib.SafeLong;
 import java.math.BigDecimal;
 import javax.annotation.Nullable;
 import javax.annotation.processing.Generated;
@@ -55,8 +54,7 @@ public static DoubleAliasExample of(double value) {
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
     public static DoubleAliasExample of(long value) {
-        long safeValue = SafeLong.of(value).longValue();
-        return new DoubleAliasExample((double) safeValue);
+        return new DoubleAliasExample((double) value);
     }
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
diff --git a/conjure-java-core/src/integrationInput/java/com/palantir/product/SafeDoubleAliasExample.java b/conjure-java-core/src/integrationInput/java/com/palantir/product/SafeDoubleAliasExample.java
index decb20142..64607d35a 100644
--- a/conjure-java-core/src/integrationInput/java/com/palantir/product/SafeDoubleAliasExample.java
+++ b/conjure-java-core/src/integrationInput/java/com/palantir/product/SafeDoubleAliasExample.java
@@ -2,7 +2,6 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
-import com.palantir.conjure.java.lib.SafeLong;
 import com.palantir.logsafe.Safe;
 import java.math.BigDecimal;
 import javax.annotation.Nullable;
@@ -58,8 +57,7 @@ public static SafeDoubleAliasExample of(@Safe double value) {
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
     public static SafeDoubleAliasExample of(@Safe long value) {
-        long safeValue = SafeLong.of(value).longValue();
-        return new SafeDoubleAliasExample((double) safeValue);
+        return new SafeDoubleAliasExample((double) value);
     }
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
diff --git a/conjure-java-core/src/integrationInput/java/test/prefix/com/palantir/product/DoubleAliasExample.java b/conjure-java-core/src/integrationInput/java/test/prefix/com/palantir/product/DoubleAliasExample.java
index c5d2cfa7d..dbf9e3f77 100644
--- a/conjure-java-core/src/integrationInput/java/test/prefix/com/palantir/product/DoubleAliasExample.java
+++ b/conjure-java-core/src/integrationInput/java/test/prefix/com/palantir/product/DoubleAliasExample.java
@@ -2,7 +2,6 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
-import com.palantir.conjure.java.lib.SafeLong;
 import java.math.BigDecimal;
 import javax.annotation.Nullable;
 import javax.annotation.processing.Generated;
@@ -55,8 +54,7 @@ public static DoubleAliasExample of(double value) {
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
     public static DoubleAliasExample of(long value) {
-        long safeValue = SafeLong.of(value).longValue();
-        return new DoubleAliasExample((double) safeValue);
+        return new DoubleAliasExample((double) value);
     }
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
diff --git a/conjure-java-core/src/integrationInput/java/test/prefix/com/palantir/product/SafeDoubleAliasExample.java b/conjure-java-core/src/integrationInput/java/test/prefix/com/palantir/product/SafeDoubleAliasExample.java
index 36ccd00dc..712489f9e 100644
--- a/conjure-java-core/src/integrationInput/java/test/prefix/com/palantir/product/SafeDoubleAliasExample.java
+++ b/conjure-java-core/src/integrationInput/java/test/prefix/com/palantir/product/SafeDoubleAliasExample.java
@@ -2,7 +2,6 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
-import com.palantir.conjure.java.lib.SafeLong;
 import com.palantir.logsafe.Safe;
 import java.math.BigDecimal;
 import javax.annotation.Nullable;
@@ -58,8 +57,7 @@ public static SafeDoubleAliasExample of(@Safe double value) {
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
     public static SafeDoubleAliasExample of(@Safe long value) {
-        long safeValue = SafeLong.of(value).longValue();
-        return new SafeDoubleAliasExample((double) safeValue);
+        return new SafeDoubleAliasExample((double) value);
     }
 
     @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
diff --git a/conjure-java-core/src/main/java/com/palantir/conjure/java/types/AliasGenerator.java b/conjure-java-core/src/main/java/com/palantir/conjure/java/types/AliasGenerator.java
index 662cdfabb..6b54069d7 100644
--- a/conjure-java-core/src/main/java/com/palantir/conjure/java/types/AliasGenerator.java
+++ b/conjure-java-core/src/main/java/com/palantir/conjure/java/types/AliasGenerator.java
@@ -20,7 +20,6 @@
 import com.google.common.collect.ImmutableList;
 import com.palantir.conjure.java.ConjureAnnotations;
 import com.palantir.conjure.java.Options;
-import com.palantir.conjure.java.lib.SafeLong;
 import com.palantir.conjure.java.util.Javadoc;
 import com.palantir.conjure.java.util.Packages;
 import com.palantir.conjure.java.util.Primitives;
@@ -148,8 +147,7 @@ public static JavaFile generateAliasType(
 
         if (isAliasOfDouble(typeDef)) {
             CodeBlock longCastCodeBlock = CodeBlock.builder()
-                    .addStatement("long safeValue = $T.of(value).longValue()", SafeLong.class)
-                    .addStatement("return new $T((double) safeValue)", thisClass)
+                    .addStatement("return new $T((double) value)", thisClass)
                     .build();
 
             CodeBlock intCastCodeBlock = CodeBlock.builder()