diff --git a/Makefile.pre.in b/Makefile.pre.in
index b42a8491733c63..3a0922ccca810e 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1449,7 +1449,7 @@ Modules/expat/xmlrole.o: $(srcdir)/Modules/expat/xmlrole.c $(LIBEXPAT_HEADERS) $
 	$(CC) -c $(LIBEXPAT_CFLAGS) -o $@ $(srcdir)/Modules/expat/xmlrole.c
 
 Modules/expat/xmltok.o: $(srcdir)/Modules/expat/xmltok.c $(LIBEXPAT_HEADERS) $(PYTHON_HEADERS)
-	$(CC) -c $(LIBEXPAT_CFLAGS) -o $@ $(srcdir)/Modules/expat/xmltok.c
+	$(CC) -Wno-unreachable-code-fallthrough -c $(LIBEXPAT_CFLAGS) -o $@ $(srcdir)/Modules/expat/xmltok.c
 
 $(LIBEXPAT_A): $(LIBEXPAT_OBJS)
 	-rm -f $@