diff --git a/src/mame/video/vtvideo.cpp b/src/mame/video/vtvideo.cpp
index d860d2cf353..fe9cd7a9939 100644
--- a/src/mame/video/vtvideo.cpp
+++ b/src/mame/video/vtvideo.cpp
@@ -108,7 +108,7 @@ void vt100_video_device::device_start()
 
 	// LBA7 is scan line frequency update
 	m_lba7_change_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(vt100_video_device::lba7_change), this));
-	m_lba7_change_timer->adjust(attotime::from_nsec(31778), 0, attotime::from_nsec(31778));
+	m_lba7_change_timer->adjust(clocks_to_attotime(765), 0, clocks_to_attotime(765));
 
 	save_item(NAME(m_lba7));
 	save_item(NAME(m_scroll_latch));