diff --git a/sys/modules/iwlwifi/Makefile b/sys/modules/iwlwifi/Makefile
index 9eadae0bbbc1..cbf03bf2ee48 100644
--- a/sys/modules/iwlwifi/Makefile
+++ b/sys/modules/iwlwifi/Makefile
@@ -1,60 +1,63 @@
 # $FreeBSD$
 
 DEVIWLWIFIDIR=	${SRCTOP}/sys/contrib/dev/iwlwifi
 
 .PATH: ${DEVIWLWIFIDIR}
 
 KMOD=	if_iwlwifi
 
 SRCS=	iwl-drv.c
 SRCS+=	iwl-dbg-tlv.c iwl-debug.c
 SRCS+=	iwl-eeprom-parse.c iwl-eeprom-read.c
 SRCS+=	iwl-io.c iwl-nvm-parse.c iwl-phy-db.c iwl-trans.c
 SRCS+=	cfg/7000.c cfg/8000.c cfg/9000.c cfg/22000.c
 SRCS+=	fw/dbg.c fw/dump.c fw/img.c fw/notif-wait.c
 SRCS+=	fw/paging.c fw/pnvm.c fw/rs.c fw/smem.c fw/init.c
 #SRCS+=	fw/uefi.c
 SRCS+=	mvm/rs.c mvm/binding.c mvm/coex.c mvm/ftm-initiator.c
 SRCS+=	mvm/ftm-responder.c mvm/fw.c mvm/mac-ctxt.c
 SRCS+=	mvm/mac80211.c mvm/nvm.c mvm/offloading.c mvm/ops.c
 SRCS+=	mvm/phy-ctxt.c mvm/power.c mvm/quota.c mvm/rs-fw.c mvm/rfi.c
 SRCS+=	mvm/rx.c mvm/rxmq.c mvm/scan.c mvm/sf.c mvm/sta.c mvm/tdls.c
 SRCS+=	mvm/time-event.c mvm/tt.c mvm/tx.c mvm/utils.c
 #SRCS+=	mvm/led.c
 SRCS+=	pcie/ctxt-info-gen3.c pcie/ctxt-info.c
 SRCS+=	pcie/drv.c pcie/rx.c pcie/trans-gen2.c pcie/trans.c
 SRCS+=	pcie/tx-gen2.c pcie/tx.c
 SRCS+=	queue/tx.c
 
 SRCS+=	iwl-devtrace.c
 
 # Other
 SRCS+=	${LINUXKPI_GENSRCS}
 SRCS+=	opt_wlan.h opt_inet6.h opt_inet.h opt_acpi.h
 
 CFLAGS+=	-DKBUILD_MODNAME='"iwlwifi"'
 
 CFLAGS+=	-I${DEVIWLWIFIDIR}
 CFLAGS+=	-I${SRCTOP}/sys/compat/linuxkpi/common/include
 CFLAGS+=	-DCONFIG_IWLDVM=0
 CFLAGS+=	-DCONFIG_IWLMVM=1
 # Helpful after fresh imports.
 #CFLAGS+=	-ferror-limit=0
 
 #CFLAGS+=	-DCONFIG_ACPI=1
 #CFLAGS+=	-DCONFIG_INET=1		# Need LKPI TSO implementation.
 #CFLAGS+=	-DCONFIG_IPV6=1
 #CFLAGS+=	-DCONFIG_IWLWIFI_BCAST_FILTERING=1
 CFLAGS+=	-DCONFIG_IWLWIFI_DEBUG=1
 #CFLAGS+=	-DCONFIG_IWLWIFI_LEDS=1
 CFLAGS+=	-DCONFIG_IWLWIFI_OPMODE_MODULAR=1
 CFLAGS+=	-DCONFIG_IWLWIFI_DEVICE_TRACING=1
 #CFLAGS+=	-DCONFIG_LOCKDEP=1
 #CFLAGS+=	-DCONFIG_MAC80211_DEBUGFS=1
 #CFLAGS+=	-DCONFIG_NL80211_TESTMODE=1
 #CFLAGS+=	-DCONFIG_PM=1
 #CFLAGS+=	-DCONFIG_PM_SLEEP=1
 #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>