diff --git a/Makefile.pre.in b/Makefile.pre.in
index 7ffc3ec..3008d6d 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -764,7 +764,7 @@
 
 TESTOPTS=	-l $(EXTRATESTOPTS)
 TESTPROG=	$(srcdir)/Lib/test/regrtest.py
-TESTPYTHON=	$(RUNSHARED) ./$(BUILDPYTHON) -Wd -E -bb $(TESTPYTHONOPTS)
+TESTPYTHON=	$(RUNSHARED) ./$(BUILDPYTHON) -Wd -E -R -bb $(TESTPYTHONOPTS)
 test:		all platform
 		-find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
 		-$(TESTPYTHON) $(TESTPROG) $(TESTOPTS)