diff --git a/mlir/include/mlir/IR/FunctionSupport.h b/mlir/include/mlir/IR/FunctionSupport.h
--- a/mlir/include/mlir/IR/FunctionSupport.h
+++ b/mlir/include/mlir/IR/FunctionSupport.h
@@ -389,8 +389,6 @@
     if (ArrayAttr argAttrs = getAllArgAttrs()) {
       auto argAttrRange = argAttrs.template getAsRange<DictionaryAttr>();
       result.append(argAttrRange.begin(), argAttrRange.end());
-    } else {
-      result.resize(getNumArguments());
     }
   }