diff --git a/src/mame/video/cps1.cpp b/src/mame/video/cps1.cpp
index e3a033618f2..770e8b6fed2 100644
--- a/src/mame/video/cps1.cpp
+++ b/src/mame/video/cps1.cpp
@@ -2306,6 +2306,8 @@ void cps_state::video_start()
 	cps1_get_video_base();   /* Calculate base pointers */
 	cps1_get_video_base();   /* Calculate old base pointers */
 
+	m_screen->register_screen_bitmap(m_dummy_bitmap);
+
 	/* state save register */
 	save_item(NAME(m_scanline1));
 	save_item(NAME(m_scanline2));
@@ -2930,7 +2932,6 @@ void cps_state::cps1_render_layer( screen_device &screen, bitmap_ind16 &bitmap,
 
 void cps_state::cps1_render_high_layer( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int layer )
 {
-	bitmap_ind16 dummy_bitmap;
 	switch (layer)
 	{
 		case 0:
@@ -2939,7 +2940,7 @@ void cps_state::cps1_render_high_layer( screen_device &screen, bitmap_ind16 &bit
 		case 1:
 		case 2:
 		case 3:
-			m_bg_tilemap[layer - 1]->draw(screen, dummy_bitmap, cliprect, TILEMAP_DRAW_LAYER0, 1);
+			m_bg_tilemap[layer - 1]->draw(screen, m_dummy_bitmap, cliprect, TILEMAP_DRAW_LAYER0, 1);
 			break;
 	}
 }
diff --git a/src/mame/video/segas16b.cpp b/src/mame/video/segas16b.cpp
index 7257076c005..fb96477975d 100644
--- a/src/mame/video/segas16b.cpp
+++ b/src/mame/video/segas16b.cpp
@@ -47,9 +47,8 @@ uint32_t segas16b_state::screen_update(screen_device &screen, bitmap_ind16 &bitm
 	m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_BACKGROUND, 1 | TILEMAP_DRAW_OPAQUE, 0x00);
 
 	// draw background again, just to set the priorities on non-transparent pixels
-	bitmap_ind16 dummy_bitmap;
-	m_segaic16vid->tilemap_draw( screen, dummy_bitmap, cliprect, 0, segaic16_video_device::TILEMAP_BACKGROUND, 0, 0x01);
-	m_segaic16vid->tilemap_draw( screen, dummy_bitmap, cliprect, 0, segaic16_video_device::TILEMAP_BACKGROUND, 1, 0x02);
+	m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_BACKGROUND, 0, 0x01);
+	m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_BACKGROUND, 1, 0x02);
 
 	// draw foreground
 	m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_FOREGROUND, 0, 0x02);