diff --git a/lib/extra/swagger-shim.ts b/lib/extra/swagger-shim.ts
index 93cb57571..943454d7d 100644
--- a/lib/extra/swagger-shim.ts
+++ b/lib/extra/swagger-shim.ts
@@ -153,16 +153,16 @@ export function SwaggerModule() {
   return () => {};
 }
 export function IntersectionType() {
-  return () => {};
+  return class {};
 }
 export function OmitType() {
-  return () => {};
+  return class {};
 }
 export function PartialType() {
-  return () => {};
+  return class {};
 }
 export function PickType() {
-  return () => {};
+  return class {};
 }
 export function getSchemaPath() {
   return () => '';