diff --git a/src/mame/drivers/deco156.c b/src/mame/drivers/deco156.c
index 2c9de6c69e7..2d1ab231763 100644
--- a/src/mame/drivers/deco156.c
+++ b/src/mame/drivers/deco156.c
@@ -36,7 +36,7 @@ public:
 	{ }
 
 	/* devices */
-	required_device<arm_device> m_maincpu;
+	required_device<arm_cpu_device> m_maincpu;
 	required_device<deco16ic_device> m_deco_tilegen1;
 	optional_device<okim6295_device> m_oki1;
 	optional_device<okim6295_device> m_oki2;