diff --git a/ghc.spec b/ghc.spec
index 77dd986..686b95b 100644
--- a/ghc.spec
+++ b/ghc.spec
@@ -332,7 +332,7 @@ autoconf
 %else
 # -Wunused-label is extremely noisy
 %ifarch aarch64 s390x
-CFLAGS="${CFLAGS:-$(echo %optflags | sed -e 's/-Wall -Werror=format-security //')}"
+CFLAGS="${CFLAGS:-$(echo %optflags | sed -e 's/-Wall //' -e 's/-Werror=format-security //')}"
 %else
 CFLAGS="${CFLAGS:-%optflags}"
 %endif