diff --git a/vm/builtin/machine_method.cpp b/vm/builtin/machine_method.cpp
index 92893d7..e1e8541 100644
--- a/vm/builtin/machine_method.cpp
+++ b/vm/builtin/machine_method.cpp
@@ -98,6 +98,7 @@ namespace rubinius {
     return ((Runner)func)(state, vmm, call_frame);
 #else
     Assertion::raise("Only supported on x86");
+    return Qfalse;
 #endif
   }