diff --git a/scripts/04-fix_kmod.sh b/scripts/04-fix_kmod.sh
index ebbc1ec..86c41c5 100644
--- a/scripts/04-fix_kmod.sh
+++ b/scripts/04-fix_kmod.sh
@@ -67,4 +67,6 @@ popd
 curl -s $mirror/openwrt/patch/packages-patches/batman-adv/901-fix-linux-6.12rc2-builds.patch > feeds/routing/batman-adv/patches/901-fix-linux-6.12rc2-builds.patch
 
 # coova-chilli - fix gcc 15 c23
-[ "$gcc" = 15 ] && sed -i '/TARGET_CFLAGS/s/$/ -std=gnu17/' feeds/packages/net/coova-chilli/Makefile
+if [ "$gcc" = 15 ]; then
+    sed -i '/TARGET_CFLAGS/s/$/ -std=gnu17/' feeds/packages/net/coova-chilli/Makefile
+fi