diff --git a/tests/expression/1.0/IExpressionExt.hal b/tests/expression/1.0/IExpressionExt.hal
index e3edf29..e96bf0d 100644
--- a/tests/expression/1.0/IExpressionExt.hal
+++ b/tests/expression/1.0/IExpressionExt.hal
@@ -34,6 +34,7 @@
         SixteenColors my16Colors;
     };
 
+    @callflow(key=@1.0::IExpression.Constants:MAX_ARRAY_SIZE)
     foo3(int32_t[IExpression.Constants:MAX_ARRAY_SIZE] array);
     foo2(SixteenColors array);
     foo1(int32_t[Constants:CONST_FOO + 5] array);