diff --git a/Makefile b/Makefile
index f32cd684f5a5798d54dbed1ab47b26f1ca36b062..086d43dd79aa4448d63eeb11796de6a912bc8f46 100644
--- a/Makefile
+++ b/Makefile
@@ -54,8 +54,9 @@ build:	.ruby-bundle $(TARGET_SETUP)
 	go install $(GO_LDFLAGS) $(COMMAND_PACKAGES)
 	cp $(foreach cmd,$(COMMANDS),$(BIN_BUILD_DIR)/$(cmd)) $(BUILD_DIR)/
 
+BUNDLE_PATH ?= vendor/bundle
 .ruby-bundle:	ruby/Gemfile.lock ruby/Gemfile
-	if test -z "${BUNDLE_PATH}" ; then cd ruby && bundle config --local path vendor/bundle; fi
+	cd ruby && bundle config --local path ${BUNDLE_PATH}
 	cd ruby && bundle install
 	touch $@