diff --git a/gen/passes/GarbageCollect2Stack.cpp b/gen/passes/GarbageCollect2Stack.cpp
index 4906b3a9..b59eb0a1 100644
--- a/gen/passes/GarbageCollect2Stack.cpp
+++ b/gen/passes/GarbageCollect2Stack.cpp
@@ -225,7 +225,7 @@ namespace {
         
         // The default promote() should be fine.
         
-        AllocClassFI() : FunctionInfo(-1, true) {}
+        AllocClassFI() : FunctionInfo(~0u, true) {}
     };
 }