diff --git a/Makefile b/Makefile
index 8073665f3c4ff1cbc83150448953168498c542c4_TWFrZWZpbGU=..e259824cf863b5e5f6f6d109bdac2dbbe69c2cf9_TWFrZWZpbGU= 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
 PYTHON=python
+TESTFLAGS ?= $(shell echo $$HGTESTFLAGS)
 
 help:
 	@echo 'Commonly used make targets:'