diff --git a/boot/uboot/uboot.mk b/boot/uboot/uboot.mk
index 3bdedd74b1..5e0f614024 100644
--- a/boot/uboot/uboot.mk
+++ b/boot/uboot/uboot.mk
@@ -272,7 +272,7 @@ define UBOOT_BUILD_OMAP_IFT
 endef
 
 ifneq ($(BR2_TARGET_UBOOT_ENVIMAGE),)
-UBOOT_GENERATE_ENV_FILE=$(call qstrip,$(BR2_TARGET_UBOOT_ENVIMAGE_SOURCE))
+UBOOT_GENERATE_ENV_FILE = $(call qstrip,$(BR2_TARGET_UBOOT_ENVIMAGE_SOURCE))
 define UBOOT_GENERATE_ENV_IMAGE
 	$(if $(UBOOT_GENERATE_ENV_FILE), \
 		cat $(UBOOT_GENERATE_ENV_FILE), \