diff --git a/Makefile.pre.in b/Makefile.pre.in
index aac765b0e9e..70e5b0e9629 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -591,6 +591,8 @@ test:		all platform
 		$(TESTPYTHON) $(TESTPROG) $(TESTOPTS)
 
 testall:	all platform
+		-find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
+		$(TESTPYTHON) Lib/compileall.py
 		-find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
 		-$(TESTPYTHON) $(TESTPROG) $(TESTOPTS) -uall
 		$(TESTPYTHON) $(TESTPROG) $(TESTOPTS) -uall