diff --git a/src/mame/drivers/murogmbl.cpp b/src/mame/drivers/murogmbl.cpp
index 931edbc6ae7..b94bb13b192 100644
--- a/src/mame/drivers/murogmbl.cpp
+++ b/src/mame/drivers/murogmbl.cpp
@@ -93,7 +93,7 @@ PALETTE_INIT_MEMBER(murogmbl_state, murogmbl)
 }
 
 static ADDRESS_MAP_START( murogmbl_map, AS_PROGRAM, 8, murogmbl_state )
-	AM_RANGE(0x0000, 0x1fFf) AM_ROM
+	AM_RANGE(0x0000, 0x1fff) AM_ROM
 	AM_RANGE(0x4000, 0x43ff) AM_RAM
 	AM_RANGE(0x4800, 0x4bff) AM_RAM
 	AM_RANGE(0x5800, 0x5bff) AM_RAM AM_SHARE("video")