diff --git a/src/mame/drivers/blockout.c b/src/mame/drivers/blockout.c
index b4624c1f438..7c105c71dfd 100644
--- a/src/mame/drivers/blockout.c
+++ b/src/mame/drivers/blockout.c
@@ -58,7 +58,7 @@ static ADDRESS_MAP_START( main_map, ADDRESS_SPACE_PROGRAM, 16 )
 	AM_RANGE(0x180000, 0x1bffff) AM_RAM_WRITE(blockout_videoram_w) AM_BASE(&blockout_videoram)
 	AM_RANGE(0x1d4000, 0x1dffff) AM_RAM	/* work RAM */
 	AM_RANGE(0x1f4000, 0x1fffff) AM_RAM	/* work RAM */
-	AM_RANGE(0x200000, 0x207fff) AM_WRITEONLY AM_BASE(&blockout_frontvideoram)
+	AM_RANGE(0x200000, 0x207fff) AM_RAM AM_BASE(&blockout_frontvideoram)
 	AM_RANGE(0x208000, 0x21ffff) AM_RAM	/* ??? */
 	AM_RANGE(0x280002, 0x280003) AM_WRITE(blockout_frontcolor_w)
 	AM_RANGE(0x280200, 0x2805ff) AM_RAM_WRITE(blockout_paletteram_w) AM_BASE(&paletteram16)