diff --git a/stepmania/src/BaseClasses/ctlutil.h b/stepmania/src/BaseClasses/ctlutil.h
index 5c69edbfde..0a244edc27 100644
--- a/stepmania/src/BaseClasses/ctlutil.h
+++ b/stepmania/src/BaseClasses/ctlutil.h
@@ -275,7 +275,7 @@ private:
     //  Prevent bugs from constructing from LONG (which gets
     //  converted to double and then multiplied by 10000000
     COARefTime(LONG);
-    operator=(LONG);
+    COARefTime& operator=(LONG l);
 };