diff --git a/mk/tests.mk b/mk/tests.mk
index 1dc8903e4f4..2fbdefb5944 100644
--- a/mk/tests.mk
+++ b/mk/tests.mk
@@ -131,6 +131,8 @@ tidy:
               $(LIBRUSTSYNTAX_INPUTS) \
               $(CORELIB_CRATE) \
               $(CORELIB_INPUTS) \
+		| xargs -n 10 python $(S)src/etc/tidy.py
+		$(Q)echo \
               $(STDLIB_CRATE) \
               $(STDLIB_INPUTS) \
               $(COMPILETEST_CRATE) \