diff --git a/Makefile b/Makefile
index 617cccb..294ad9c 100644
--- a/Makefile
+++ b/Makefile
@@ -42,6 +42,7 @@ check:
 	check-copyright
 	check-pofiles -v
 	py-tabdaddy
+	py-unittest2-compat tests/
 	$(MAKE) pyflakes
 
 .PHONY: pyflakes