diff --git a/package/boot/uboot-mxs/Makefile b/package/boot/uboot-mxs/Makefile
index cd752bb81a..6fde52ef56 100644
--- a/package/boot/uboot-mxs/Makefile
+++ b/package/boot/uboot-mxs/Makefile
@@ -35,7 +35,7 @@ UBOOT_TARGETS := \
 	mx23_olinuxino \
 	duckbill
 
-UBOOT_MAKE_FLAGS += $(UBOOT_IMAGE)
+UBOOT_MAKE_FLAGS = $(UBOOT_IMAGE)
 
 define Build/InstallDev
 	$(INSTALL_DIR) $(STAGING_DIR_IMAGE)