diff --git a/sys/modules/iwlwifi/Makefile b/sys/modules/iwlwifi/Makefile
--- a/sys/modules/iwlwifi/Makefile
+++ b/sys/modules/iwlwifi/Makefile
@@ -92,6 +92,6 @@
 #CFLAGS+=	-DCONFIG_EFI=1
 
 # XXX-BZ how to do this just for pcie/drv.c (and gcc vs. clang)?
-CFLAGS += -Wno-override-init -Wno-initializer-overrides
+CFLAGS.clang+=	-Wno-override-init -Wno-initializer-overrides
 
 .include <bsd.kmod.mk>