diff --git a/src/mame/audio/m79amb.c b/src/mame/audio/m79amb.c
index 6605b2251c3..abcffa6e66c 100644
--- a/src/mame/audio/m79amb.c
+++ b/src/mame/audio/m79amb.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Al Kossow
 /************************************************************************
  * m79amb Sound System Analog emulation
diff --git a/src/mame/drivers/m79amb.c b/src/mame/drivers/m79amb.c
index 261ccfcc19e..7fcaf671cc8 100644
--- a/src/mame/drivers/m79amb.c
+++ b/src/mame/drivers/m79amb.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Al Kossow
 /*          Ramtek M79 Ambush
 
diff --git a/src/mame/includes/m79amb.h b/src/mame/includes/m79amb.h
index b387d8cad1d..22574023cf5 100644
--- a/src/mame/includes/m79amb.h
+++ b/src/mame/includes/m79amb.h
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Al Kossow
 #include "sound/discrete.h"