diff --git a/tests/bar/1.0/IBar.hal b/tests/bar/1.0/IBar.hal
index 82c6fc1..21c3473 100644
--- a/tests/bar/1.0/IBar.hal
+++ b/tests/bar/1.0/IBar.hal
@@ -31,4 +31,6 @@
 
     thisIsNew();
     expectNullHandle(handle h, Abc xyz) generates (bool hIsNull, bool xyzHasNull);
+    takeAMask(BitField bf, bitfield<BitField> first, MyMask second, Mask third)
+            generates (BitField bf, uint8_t first, uint8_t second, uint8_t third);
 };