diff --git a/karaoke-split.lua b/karaoke-split.lua
index 4da6506..8bf8dd6 100644
--- a/karaoke-split.lua
+++ b/karaoke-split.lua
@@ -11,11 +11,8 @@ function split_line(subs, sel)
         d = 0
 
         kduration = "{[^}]-\\[kK][fo]?(%d+)[^}]-}"
-        _, iend, match = line:find(kduration)
-        while match do
+        for match in line:gmatch(kduration) do
             d = d + tonumber(match)
-            line = line:sub(iend + 1) -- keep looking for more
-            _, iend, match = line:find(kduration)
         end
 
         return d * 10