diff --git a/common.mk b/common.mk
index 81d6877dd7..8ca47c16ee 100644
--- a/common.mk
+++ b/common.mk
@@ -625,7 +625,7 @@ clean-html: PHONY
 clean-capi: PHONY
 clean-platform: PHONY
 clean-extout: PHONY
-	-$(Q)$(RMDIR) $(EXTOUT)/$(arch) $(EXTOUT) 2> $(NULL) || $(NULLCMD)
+	-$(Q)$(RMDIR) $(EXTOUT)/$(arch) $(RUBYCOMMONDIR) $(EXTOUT) 2> $(NULL) || $(NULLCMD)
 clean-docs: clean-rdoc clean-html clean-capi
 clean-spec: PHONY
 clean-rubyspec: clean-spec