diff --git a/m4 b/m4
index e490e14fb..f5b39ccf9 160000
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit e490e14fb13595428d39055304bcf0ee7ab94806
+Subproject commit f5b39ccf9ebf30a919f1a36ea05a3b53e84cd899