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 {