diff --git a/boot/at91bootstrap3/at91bootstrap3.mk b/boot/at91bootstrap3/at91bootstrap3.mk
index f35ffc71c4..3e3b78ef23 100644
--- a/boot/at91bootstrap3/at91bootstrap3.mk
+++ b/boot/at91bootstrap3/at91bootstrap3.mk
@@ -32,10 +32,12 @@ define AT91BOOTSTRAP3_INSTALL_IMAGES_CMDS
 endef
 
 ifeq ($(BR2_TARGET_AT91BOOTSTRAP3_USE_DEFCONFIG),y)
-AT91BOOTSTRAP3_KCONFIG_FILE = $(AT91BOOTSTRAP3_DIR)/board/*/$(call qstrip,$(BR2_TARGET_AT91BOOTSTRAP3_DEFCONFIG))_defconfig
+AT91BOOTSTRAP3_SOURCE_CONFIG = $(AT91BOOTSTRAP3_DIR)/board/*/$(call qstrip,$(BR2_TARGET_AT91BOOTSTRAP3_DEFCONFIG))_defconfig
 else ifeq ($(BR2_TARGET_AT91BOOTSTRAP3_USE_CUSTOM_CONFIG),y)
-AT91BOOTSTRAP3_KCONFIG_FILE = $(call qstrip,$(BR2_TARGET_AT91BOOTSTRAP3_CUSTOM_CONFIG_FILE))
+AT91BOOTSTRAP3_SOURCE_CONFIG = $(call qstrip,$(BR2_TARGET_AT91BOOTSTRAP3_CUSTOM_CONFIG_FILE))
 endif
+
+AT91BOOTSTRAP3_KCONFIG_FILE = $(AT91BOOTSTRAP3_SOURCE_CONFIG)
 AT91BOOTSTRAP3_KCONFIG_EDITORS = menuconfig xconfig gconfig
 AT91BOOTSTRAP3_KCONFIG_OPTS = $(AT91BOOTSTRAP3_MAKE_OPTS)
 $(eval $(kconfig-package))