diff --git a/package/lan951x-led-ctl/lan951x-led-ctl.mk b/package/lan951x-led-ctl/lan951x-led-ctl.mk
index dcaaefd981..a30e3b0cb8 100644
--- a/package/lan951x-led-ctl/lan951x-led-ctl.mk
+++ b/package/lan951x-led-ctl/lan951x-led-ctl.mk
@@ -3,7 +3,7 @@ LAN951X_LED_CTL_SITE = $(call github,dumpsite,lan951x-led-ctl,$(LAN951X_LED_CTL_
 LAN951X_LED_CTL_DEPENDENCIES = libusb
 
 define LAN951X_LED_CTL_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D) CFLAGS="$(TARGET_CLFAGS) -Iinclude"
+	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D) CFLAGS="$(TARGET_CLFAGS) -Iinclude -std=c99"
 endef
 
 define LAN951X_LED_CTL_INSTALL_TARGET_CMDS