diff --git a/src/mame/video/namco_c123tmap.cpp b/src/mame/video/namco_c123tmap.cpp
index 41768059e21..a5e25b2c19e 100644
--- a/src/mame/video/namco_c123tmap.cpp
+++ b/src/mame/video/namco_c123tmap.cpp
@@ -125,14 +125,14 @@ void namco_c123tmap_device::init_scroll(int flip) // 8 bit control with external
 	}
 }
 
-void namco_c123tmap_device::draw(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int pri, int prival)
+void namco_c123tmap_device::draw(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int pri, int prival, int primask)
 {
 	for (int i = 0; i < 6; i++)
 	{
 		// bit 3 : disable layer
 		if ((m_tilemapinfo.control[0x20 / 2 + i] & 0x7) == pri)
 		{
-			m_tilemapinfo.tmap[i]->draw(screen, bitmap, cliprect, 0, prival);
+			m_tilemapinfo.tmap[i]->draw(screen, bitmap, cliprect, 0, prival, primask);
 		}
 	}
 } /* draw */
diff --git a/src/mame/video/namco_c123tmap.h b/src/mame/video/namco_c123tmap.h
index 28c5d6be021..ce1d8e5a613 100644
--- a/src/mame/video/namco_c123tmap.h
+++ b/src/mame/video/namco_c123tmap.h
@@ -39,7 +39,7 @@ public:
 
 	void mark_all_dirty(void);
 	void init_scroll(int flip);
-	void draw(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int pri, int prival = 0);
+	void draw(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int pri, int prival = 0, int primask = 0xff);
 
 protected:
 	// device-level overrides
diff --git a/src/mame/video/namcos1.cpp b/src/mame/video/namcos1.cpp
index 74582311df2..af5c91be3a1 100644
--- a/src/mame/video/namcos1.cpp
+++ b/src/mame/video/namcos1.cpp
@@ -237,7 +237,7 @@ uint32_t namcos1_state::screen_update(screen_device &screen, bitmap_ind16 &bitma
 	/* bit 3   disable  */
 	for (int priority = 0; priority < 8; priority++)
 	{
-		m_c123tmap->draw(screen, bitmap, new_clip, priority, priority);
+		m_c123tmap->draw(screen, bitmap, new_clip, priority, priority, 0);
 	}
 
 	draw_sprites(screen, bitmap, new_clip);