diff --git a/frontend/src/hooks/tools/flatten/useFlattenParameters.ts b/frontend/src/hooks/tools/flatten/useFlattenParameters.ts
index c945fb769..98c5b9655 100644
--- a/frontend/src/hooks/tools/flatten/useFlattenParameters.ts
+++ b/frontend/src/hooks/tools/flatten/useFlattenParameters.ts
@@ -15,6 +15,5 @@ export const useFlattenParameters = (): FlattenParametersHook => {
   return useBaseParameters({
     defaultParameters,
     endpointName: 'flatten',
-    validateFn: () => true, // Always valid - no required parameters
   });
 };
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