diff --git a/m4 b/m4
index b7c7676..aa2a16f 160000
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit b7c7676b3056f0e38b593ef494e2202db3936b13
+Subproject commit aa2a16fefaf06f6f7c343ea85c7aabd5310ca826