diff --git a/include/mlir-hlo/Dialect/mhlo/IR/lhlo_ops.td b/include/mlir-hlo/Dialect/mhlo/IR/lhlo_ops.td
index 3d5a4a3..7d862ab 100644
--- a/include/mlir-hlo/Dialect/mhlo/IR/lhlo_ops.td
+++ b/include/mlir-hlo/Dialect/mhlo/IR/lhlo_ops.td
@@ -654,7 +654,7 @@ def FusionOp : LHLO_Op<"fusion", [SingleBlockImplicitTerminator<"TerminatorOp">]
 
   let skipDefaultBuilders = 1;
   let builders = [
-     OpBuilderDAG<(ins "ArrayRef<NamedAttribute>":$attributes)>
+     OpBuilderDAG<(ins CArg<"ArrayRef<NamedAttribute>", "{}">:$attributes)>
   ];
 
   let extraClassDeclaration = [{