diff --git a/apps/function_lib/serializers/function_lib_serializer.py b/apps/function_lib/serializers/function_lib_serializer.py
index 6c658ab81..cccdfcdc3 100644
--- a/apps/function_lib/serializers/function_lib_serializer.py
+++ b/apps/function_lib/serializers/function_lib_serializer.py
@@ -249,7 +249,7 @@ class FunctionLibSerializer(serializers.Serializer):
                 mk_instance = FlibInstance(application_dict, 'v1')
                 application_pickle = pickle.dumps(mk_instance)
                 response = HttpResponse(content_type='text/plain', content=application_pickle)
-                response['Content-Disposition'] = f'attachment; filename="{function_lib.name}.flib"'
+                response['Content-Disposition'] = f'attachment; filename="{function_lib.name}.fx"'
                 return response
             except Exception as e:
                 return result.error(str(e), response_status=status.HTTP_500_INTERNAL_SERVER_ERROR)
diff --git a/ui/src/api/function-lib.ts b/ui/src/api/function-lib.ts
index f9082a308..41a90a96c 100644
--- a/ui/src/api/function-lib.ts
+++ b/ui/src/api/function-lib.ts
@@ -105,7 +105,7 @@ const exportFunctionLib = (
   loading?: Ref<boolean>
 ) => {
   return exportFile(
-    name + '.flib',
+    name + '.fx',
     `${prefix}/${id}/export`,
     undefined,
     loading