diff --git a/tests/foo/1.0/IFooCallback.hal b/tests/foo/1.0/IFooCallback.hal
index 0e34266..7b25df3 100644
--- a/tests/foo/1.0/IFooCallback.hal
+++ b/tests/foo/1.0/IFooCallback.hal
@@ -5,6 +5,6 @@
 interface IFooCallback {
     //heyItsMe(IFoo cb);
     heyItsYou(IFooCallback cb);
-    heyItsYouIsntIt(IFooCallback cb) generates (uint8_t yesOrNo);
+    heyItsYouIsntIt(IFooCallback cb) generates (bool yesOrNo);
     oneway heyItsTheMeaningOfLife(uint8_t tmol);
 };