diff --git a/clean-k-tags.lua b/clean-k-tags.lua
index e7b9e33..2cb6e4f 100644
--- a/clean-k-tags.lua
+++ b/clean-k-tags.lua
@@ -8,7 +8,7 @@ script_version = "1.0"
 function special_k(subs, sel)
 
     -- if the first tag is K/kf this would break the timing for the previous timing
-    local expr = "^(.-){\\(ko?)([0-9.]*)[^}]-}([^{]-){\\[kK][fo]?([0-9.]*)[^}]-}( -{(\\[kK][fo]?)[0-9.]*[^}]-}.*)$"
+    local expr = "^(.-){\\(ko?)([0-9.]+)[^}]-}([^{]-){\\[kK][fo]?([0-9.]+)[^}]-}( -{(\\[kK][fo]?)[0-9.]+[^}]-}.*)$"
 
     for _, i in ipairs(sel) do
         line = subs[i]