diff --git a/Makefile b/Makefile
index f59c91d..0c7b2e9 100644
--- a/Makefile
+++ b/Makefile
@@ -25,3 +25,6 @@ $(_TESTS_REL_AND_ABS):
 .PHONY: $(_TESTS_REL_AND_ABS)
 
 .PHONY: itest test
+
+clean:
+	$(RM) tests/*.err