diff --git a/Makefile b/Makefile
index 58e3d0f6..ce0f6c45 100644
--- a/Makefile
+++ b/Makefile
@@ -38,6 +38,7 @@ uninstall:
 	done
 
 check:
+	-rm -f result.db*
 	@./run-tests
 
 clean: