diff --git a/Makefile b/Makefile
index 2fcd796..fe7db9d 100644
--- a/Makefile
+++ b/Makefile
@@ -16,4 +16,4 @@ uninstall:
 
 .PHONY: test
 test: build
-	@(cd tests; rspec)
+	@(cd tests; bundle exec rspec)