diff --git a/package/ebtables/ebtables.mk b/package/ebtables/ebtables.mk
index 66a47a2d90..578c3ae805 100644
--- a/package/ebtables/ebtables.mk
+++ b/package/ebtables/ebtables.mk
@@ -10,11 +10,11 @@ EBTABLES_SITE = http://downloads.sourceforge.net/project/ebtables/ebtables/ebtab
 EBTABLES_LICENSE = GPLv2+
 EBTABLES_LICENSE_FILES = COPYING
 EBTABLES_STATIC = $(if $(BR2_PREFER_STATIC_LIB),static)
-EBTABLES_K64U32 = $(if $(BR2_KERNEL_64_USERLAND_32),CFLAGS+="-DKERNEL_64_USERSPACE_32")
+EBTABLES_K64U32 = $(if $(BR2_KERNEL_64_USERLAND_32),-DKERNEL_64_USERSPACE_32)
 
 define EBTABLES_BUILD_CMDS
 	$(MAKE) $(TARGET_CONFIGURE_OPTS) LIBDIR=/lib/ebtables $(EBTABLES_STATIC) \
-		$(EBTABLES_K64U32) -C $(@D)
+		CFLAGS="$(TARGET_CFLAGS) $(EBTABLES_K64U32)" -C $(@D)
 endef
 
 ifeq ($(BR2_PREFER_STATIC_LIB),y)