diff --git a/src/emu/screen.h b/src/emu/screen.h
index a5527e72226..87545fc99a5 100644
--- a/src/emu/screen.h
+++ b/src/emu/screen.h
@@ -398,6 +398,7 @@ public:
 	attotime time_until_vblank_end() const;
 	attotime time_until_update() const { return (m_video_attributes & VIDEO_UPDATE_AFTER_VBLANK) ? time_until_vblank_end() : time_until_vblank_start(); }
 	attotime scan_period() const { return attotime(0, m_scantime); }
+	attotime pixel_period() const { return attotime(0, m_pixeltime); }
 	attotime frame_period() const { return attotime(0, m_frame_period); }
 	u64 frame_number() const { return m_frame_number; }