diff --git a/Makefile.pre.in b/Makefile.pre.in
index 47878256ed9..8eab038c400 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -913,12 +913,12 @@ libinstall:	build_all $(srcdir)/Lib/$(PLATDIR)
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST)  $(RUNSHARED) \
 		./$(BUILDPYTHON) -Wi $(DESTDIR)$(LIBDEST)/compileall.py \
 		-d $(LIBDEST) -f \
-		-x 'badsyntax|site-packages|lib2to3/tests/data' \
+		-x 'bad_coding|badsyntax|site-packages|lib2to3/tests/data' \
 		$(DESTDIR)$(LIBDEST)
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST) $(RUNSHARED) \
 		./$(BUILDPYTHON) -Wi -O $(DESTDIR)$(LIBDEST)/compileall.py \
 		-d $(LIBDEST) -f \
-		-x 'badsyntax|site-packages|lib2to3/tests/data' \
+		-x 'bad_coding|badsyntax|site-packages|lib2to3/tests/data' \
 		$(DESTDIR)$(LIBDEST)
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST)  $(RUNSHARED) \
 		./$(BUILDPYTHON) -Wi $(DESTDIR)$(LIBDEST)/compileall.py \