diff --git a/Makefile.in b/Makefile.in
index 3d75f15c6ef..90548053130 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -170,8 +170,8 @@ TESTOPTS=
 TESTPROG=	$(srcdir)/Lib/test/regrtest.py
 test:		python
 		-rm -f $(srcdir)/Lib/test/*.pyc
-		./python $(TESTPROG) $(TESTOPTS)
-		./python $(TESTPROG) $(TESTOPTS)
+		PYTHONPATH= ./python $(TESTPROG) $(TESTOPTS)
+		PYTHONPATH= ./python $(TESTPROG) $(TESTOPTS)
 
 # Install everything
 install:	altinstall bininstall maninstall