diff --git a/src/mame/drivers/naomi.cpp b/src/mame/drivers/naomi.cpp
index 48d97bb9703..3ea5dc88baf 100644
--- a/src/mame/drivers/naomi.cpp
+++ b/src/mame/drivers/naomi.cpp
@@ -7625,10 +7625,10 @@ ROM_START( azumanga )
 	DISK_REGION( "gdrom" )
 	DISK_IMAGE_READONLY( "gdl-0018", 0, SHA1(749a56dd64ab697f17470d8ae797f7e20e9eb646) )
 
-	ROM_REGION( 0x50, "pic", ROMREGION_ERASE)
+	ROM_REGION( 0x4000, "pic", ROMREGION_ERASE)
 	//PIC16C622A (317-5091-JPN)
 	//(sticker 253-5509-5091J)
-	ROM_LOAD("317-5091-jpn.data", 0x00, 0x50, CRC(ca589c79) SHA1(ac44bfdfc8db2f9dbe4d563205719524bf43a674) )
+	ROM_LOAD("317-5091-jpn.pic", 0x00, 0x4000, CRC(b71ede16) SHA1(0c27f335d4b81b0413301477813651c4cbba9981) )
 ROM_END
 
 ROM_START( ggxxrl )