diff --git a/Makefile b/Makefile
index bafa4c3b738579df00355c23664f9635e93e2810_TWFrZWZpbGU=..fddb62eaf21774d0e0c80df85d5f437ffc8ac3bb_TWFrZWZpbGU= 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@
 all: help
 
 tests:
-	python -m doctest hggit/*.py contrib/*.py
+	$(PYTHON) -m doctest hggit/*.py contrib/*.py
 	cd tests && $(PYTHON) run-tests.py --with-hg=`which hg` $(TESTFLAGS)
 
 test-%: