diff --git a/package/m4/m4.hash b/package/m4/m4.hash
index 79c36c8706..e665fc149f 100644
--- a/package/m4/m4.hash
+++ b/package/m4/m4.hash
@@ -1,2 +1,4 @@
 # Locally calculated after checking pgp signature
 sha256	f2c1e86ca0a404ff281631bdc8377638992744b175afb806e25871a24a934e07	m4-1.4.18.tar.xz
+# License files, locally calculated
+sha256	8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903	COPYING