diff --git a/tests/foo/1.0/IFoo.hal b/tests/foo/1.0/IFoo.hal
index 3d82353..614f1e4 100644
--- a/tests/foo/1.0/IFoo.hal
+++ b/tests/foo/1.0/IFoo.hal
@@ -80,6 +80,7 @@
     };
 
     doThis(float param);
+    doThis(uint32_t param);
     doThatAndReturnSomething(int64_t param) generates (int32_t result);
     doQuiteABit(int32_t a, int64_t b, float c, double d) generates (double something);
     doSomethingElse(int32_t[15] param) generates (int32_t[32] something);