diff --git a/reactos/ReactOS.rbuild b/reactos/ReactOS.rbuild
index 374a7b1eef5..cdd6d7f84d9 100644
--- a/reactos/ReactOS.rbuild
+++ b/reactos/ReactOS.rbuild
@@ -35,18 +35,22 @@
-Os
+ -Wno-strict-aliasing
-mpreferred-stack-boundary=2
-O1
+ -Wno-strict-aliasing
-mpreferred-stack-boundary=2
-O2
+ -Wno-strict-aliasing
-mpreferred-stack-boundary=2
-O3
+ -Wno-strict-aliasing
-mpreferred-stack-boundary=2