diff --git a/include/u-boot.mk b/include/u-boot.mk
index 1bd7ed4bd56..529d69f4ba7 100644
--- a/include/u-boot.mk
+++ b/include/u-boot.mk
@@ -78,6 +78,7 @@ UBOOT_MAKE_FLAGS = \
 	PKG_CONFIG_PATH="$(STAGING_DIR_HOST)/lib/pkgconfig" \
 	PKG_CONFIG_LIBDIR="$(STAGING_DIR_HOST)/lib/pkgconfig" \
 	PKG_CONFIG_EXTRAARGS="--static" \
+	$(if $(KBUILD_CFLAGS),KCFLAGS="$(KBUILD_CFLAGS)") \
 	$(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='')
 
 define Build/U-Boot/Target
diff --git a/package/boot/uboot-bcm4908/Makefile b/package/boot/uboot-bcm4908/Makefile
index 7bc49860072..313a96161ba 100644
--- a/package/boot/uboot-bcm4908/Makefile
+++ b/package/boot/uboot-bcm4908/Makefile
@@ -32,6 +32,12 @@ define U-Boot/bcm4912
   SOC:=bcm4912
 endef
 
+KBUILD_CFLAGS := \
+	-Wno-error=implicit-function-declaration \
+	-Wno-error=implicit-int \
+	-Wno-error=incompatible-pointer-types \
+	-Wno-error=int-conversion
+
 UBOOT_TARGETS := \
 	bcm4908 \
 	bcm4912