diff --git a/tests/Makefile.am b/tests/Makefile.am
index 014de6f..ea57bda 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -61,3 +61,4 @@ TESTS_ENVIRONMENT       = top_builddir=$(top_builddir)
 
 distclean-local:
 	-rm -rf $(testsubdir)
+	-rm -f *.vg.out