diff --git a/src/mame/drivers/wallc.cpp b/src/mame/drivers/wallc.cpp
index ce3780b746b..e70b15ab61d 100644
--- a/src/mame/drivers/wallc.cpp
+++ b/src/mame/drivers/wallc.cpp
@@ -100,6 +100,7 @@ private:
 
 	TILE_GET_INFO_MEMBER(get_bg_tile_info);
 	TILE_GET_INFO_MEMBER(get_bg_tile_info_unkitpkr);
+	TILE_GET_INFO_MEMBER(get_bg_tile_info_sidampkr);
 	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 
 	DECLARE_PALETTE_INIT(wallc);
@@ -233,6 +234,11 @@ TILE_GET_INFO_MEMBER(wallc_state::get_bg_tile_info_unkitpkr)
 	SET_TILE_INFO_MEMBER(0, code, 1, 0);
 }
 
+TILE_GET_INFO_MEMBER(wallc_state::get_bg_tile_info_sidampkr)
+{
+	SET_TILE_INFO_MEMBER(0, m_videoram[tile_index] | 0x100, 0, 0);
+}
+
 void wallc_state::video_start()
 {
 	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(wallc_state::get_bg_tile_info), this), TILEMAP_SCAN_COLS_FLIP_Y, 8, 8, 32, 32);
@@ -245,7 +251,7 @@ VIDEO_START_MEMBER(wallc_state, unkitpkr)
 
 VIDEO_START_MEMBER(wallc_state, sidampkr)
 {
-	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(wallc_state::get_bg_tile_info), this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
+	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(wallc_state::get_bg_tile_info_sidampkr), this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
 }
 
 uint32_t wallc_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)