diff --git a/src/emu/diexec.c b/src/emu/diexec.c
index a20ae05fbf9..fc5825c242a 100644
--- a/src/emu/diexec.c
+++ b/src/emu/diexec.c
@@ -556,16 +556,8 @@ void device_execute_interface::interface_post_reset()
 	if (m_vblank_interrupt_screen != NULL)
 	{
 		// get the screen that will trigger the VBLANK
-
-		// new style - use screen tag directly
-		screen_device *screen;
-		if (m_vblank_interrupt_screen != NULL) {
-			astring tempstring;
-			screen = downcast<screen_device *>(device().machine().device(device().siblingtag(tempstring,m_vblank_interrupt_screen)));
-		}
-		// old style 'hack' setup - use screen #0
-		else
-			screen = device().machine().first_screen();
+		astring tempstring;
+		screen_device *screen = downcast<screen_device *>(device().machine().device(device().siblingtag(tempstring,m_vblank_interrupt_screen)));
 
 		assert(screen != NULL);
 		screen->register_vblank_callback(vblank_state_delegate(FUNC(device_execute_interface::on_vblank), this));