diff --git a/tests/ref/fate/apng-clock b/tests/ref/fate/apng-clock
index 54db0944b7..c0480fd4e6 100644
--- a/tests/ref/fate/apng-clock
+++ b/tests/ref/fate/apng-clock
@@ -1,4 +1,4 @@
-#tb 0: 6667/100000
+#tb 0: 1/25
 #media_type 0: video
 #codec_id 0: rawvideo
 #dimensions 0: 150x150