diff --git a/aegisub/src/ass_karaoke.cpp b/aegisub/src/ass_karaoke.cpp
index c89ba3590..b67cb47b5 100644
--- a/aegisub/src/ass_karaoke.cpp
+++ b/aegisub/src/ass_karaoke.cpp
@@ -202,7 +202,7 @@ void AssKaraoke::AddSplit(size_t syl_idx, size_t pos) {
 		syl.duration = 0;
 	}
 	else {
-		new_syl.duration = syl.duration * new_syl.text.size() / (syl.text.size() + new_syl.text.size());
+		new_syl.duration = (syl.duration * new_syl.text.size() / (syl.text.size() + new_syl.text.size()) + 5) / 10 * 10;
 		syl.duration -= new_syl.duration;
 	}