diff --git a/software/videomixer/dvisamplerX.c b/software/videomixer/dvisamplerX.c
index 35e9225a3..8e4965475 100644
--- a/software/videomixer/dvisamplerX.c
+++ b/software/videomixer/dvisamplerX.c
@@ -167,7 +167,7 @@ void dvisamplerX_service(void)
 
 	if(dvisamplerX_locked) {
 		if(dvisamplerX_clocking_locked_read()) {
-			if(elapsed(&dvisamplerX_last_event, identifier_frequency_read())) {
+			if(elapsed(&dvisamplerX_last_event, identifier_frequency_read()/2)) {
 				dvisamplerX_adjust_phase();
 				dvisamplerX_print_status();
 			}