diff --git a/boot/at91bootstrap3/at91bootstrap3.mk b/boot/at91bootstrap3/at91bootstrap3.mk
index 74f08e8..bb6ef09 100644
--- a/boot/at91bootstrap3/at91bootstrap3.mk
+++ b/boot/at91bootstrap3/at91bootstrap3.mk
@@ -65,3 +65,10 @@ $(error No at91bootstrap3 configuration file specified, check your BR2_TARGET_AT
 endif
 endif
 endif
+
+ifeq ($(BR2_TARGET_AT91BOOTSTRAP3_USE_CUSTOM_CONFIG),y)
+at91bootstrap3-update-config: at91bootstrap3-configure
+	cp -f $(AT91BOOTSTRAP3_DIR)/.config $(AT91BOOTSTRAP3_CUSTOM_CONFIG_FILE)
+else
+at91bootstrap3-update-config: ;
+endif