diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/FsharpGiraffeServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/FsharpGiraffeServerCodegen.java
index 1b3fc948d0d..5a84940292c 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/FsharpGiraffeServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/FsharpGiraffeServerCodegen.java
@@ -18,7 +18,6 @@ package org.openapitools.codegen.languages;
 
 import com.samskivert.mustache.Mustache;
 import io.swagger.v3.oas.models.OpenAPI;
-import sun.reflect.generics.reflectiveObjects.NotImplementedException;
 
 import org.openapitools.codegen.CodegenConstants;
 import org.openapitools.codegen.CodegenOperation;