diff --git a/Makefile b/Makefile
index 2b832d0144670b..8d759c2fcf89b6 100644
--- a/Makefile
+++ b/Makefile
@@ -501,6 +501,7 @@ test-v8: v8
         --no-presubmit \
         --shell-dir=$(PWD)/deps/v8/out/$(V8_ARCH).$(BUILDTYPE_LOWER) \
 	 $(TAP_V8)
+	git clean -fdxq -- deps/v8
 	@echo Testing hash seed
 	$(MAKE) test-hash-seed