diff --git a/src/mame/etc/jrcrypt.c b/src/mame/etc/jrcrypt.c
index 399c16d7722..b1244151243 100644
--- a/src/mame/etc/jrcrypt.c
+++ b/src/mame/etc/jrcrypt.c
@@ -1,4 +1,4 @@
-// license:???
+// license:GPL-2.0+
 // copyright-holders:David Caldwell
 /***************************************************************************