diff --git a/Sources/GRPCCodeGen/CodeGenerationRequest.swift b/Sources/GRPCCodeGen/CodeGenerationRequest.swift
index 5106b3c58..fbe545dbe 100644
--- a/Sources/GRPCCodeGen/CodeGenerationRequest.swift
+++ b/Sources/GRPCCodeGen/CodeGenerationRequest.swift
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import Foundation
+
 /// Describes the services, dependencies and trivia from an IDL file,
 /// and the IDL itself through its specific serializer and deserializer.
 public struct CodeGenerationRequest {
diff --git a/Sources/GRPCCodeGen/Internal/Translator/Docs.swift b/Sources/GRPCCodeGen/Internal/Translator/Docs.swift
index 1d4b1e1fd..c0017e293 100644
--- a/Sources/GRPCCodeGen/Internal/Translator/Docs.swift
+++ b/Sources/GRPCCodeGen/Internal/Translator/Docs.swift
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import Foundation
+
 package enum Docs {
   package static func suffix(_ header: String, withDocs footer: String) -> String {
     if footer.isEmpty {
diff --git a/Tests/GRPCCoreTests/Configuration/ServiceConfigCodingTests.swift b/Tests/GRPCCoreTests/Configuration/ServiceConfigCodingTests.swift
index cb5e38b7a..787d87e0f 100644
--- a/Tests/GRPCCoreTests/Configuration/ServiceConfigCodingTests.swift
+++ b/Tests/GRPCCoreTests/Configuration/ServiceConfigCodingTests.swift
@@ -16,6 +16,7 @@
 
 import Foundation
 import GRPCCore
+import SwiftProtobuf
 import XCTest
 
 final class ServiceConfigCodingTests: XCTestCase {
diff --git a/Tests/GRPCCoreTests/Test Utilities/Services/HelloWorld.swift b/Tests/GRPCCoreTests/Test Utilities/Services/HelloWorld.swift
index a464cec02..253fbca1c 100644
--- a/Tests/GRPCCoreTests/Test Utilities/Services/HelloWorld.swift	
+++ b/Tests/GRPCCoreTests/Test Utilities/Services/HelloWorld.swift	
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import Foundation
 import GRPCCore
 
 struct HelloWorld: RegistrableRPCService {