diff --git a/Makefile.in b/Makefile.in
index 0e79a77da..eb3ec02b2 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -533,6 +533,7 @@ EMAIL=wsf@fultondesigns.co.uk
 PASSWORD=
 coverity:
 	$(MAKE) clean-source
+	rm -rf cov-int
 	cov-build --dir cov-int $(MAKE)
 	tar czvf swig-coverity.tgz cov-int
 	curl --form file=@swig-coverity.tgz --form project=swig --form password=$(PASSWORD) --form email=$(EMAIL) http://scan5.coverity.com/cgi-bin/upload.py