diff --git a/sys/modules/iwlwifi/Makefile b/sys/modules/iwlwifi/Makefile
--- a/sys/modules/iwlwifi/Makefile
+++ b/sys/modules/iwlwifi/Makefile
@@ -57,4 +57,7 @@
 #CFLAGS+=	-DCONFIG_THERMAL=1
 #CFLAGS+=	-DCONFIG_EFI=1
 
+# GCC warns about NULL format strings passed to iwl_fw_dbg_collect_trig
+CWARNFLAGS.gcc+= -Wno-format
+
 .include <bsd.kmod.mk>