diff --git a/Makefile.in b/Makefile.in
index 2c926557915..eab8e2e5af4 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -158,7 +158,7 @@ python:		Makefiles
 # Test the interpreter (twice, once without .pyc files, once with)
 TESTPATH=	$(srcdir)/Lib:$(srcdir)/Lib/test:./Modules
 TESTOPTS=	
-TESTPROG=	Lib/test/regrtest.py
+TESTPROG=	$(srcdir)/Lib/test/regrtest.py
 test:		python
 		-rm -f $(srcdir)/Lib/test/*.pyc
 		PYTHONPATH=$(TESTPATH) ./python $(TESTPROG) $(TESTOPTS)