diff --git a/karaoke-split.lua b/karaoke-split.lua
index 2eb2d3d..4da6506 100644
--- a/karaoke-split.lua
+++ b/karaoke-split.lua
@@ -8,32 +8,32 @@ script_version = "1.0"
 function split_line(subs, sel)
 
     function getduration(line)
-	d = 0
+        d = 0
 
-	kduration = "{[^}]-\\[kK][fo]?(%d+)[^}]-}"
-	_, iend, match = line:find(kduration)
-	while match do
-	    d = d + tonumber(match)
-	    line = line:sub(iend + 1) -- keep looking for more
-	    _, iend, match = line:find(kduration)
-	end
+        kduration = "{[^}]-\\[kK][fo]?(%d+)[^}]-}"
+        _, iend, match = line:find(kduration)
+        while match do
+            d = d + tonumber(match)
+            line = line:sub(iend + 1) -- keep looking for more
+            _, iend, match = line:find(kduration)
+        end
 
-	return d * 10
+        return d * 10
     end
 
     for _, i in ipairs(sel) do
         line1 = subs[i]
-	line2 = subs[i]
+        line2 = subs[i]
 
-	line1.text, line2.text = line1.text:match("(.-){split}(.*)")
+        line1.text, line2.text = line1.text:match("(.-){split}(.*)")
 
-	if line1.text ~= nil then
-	    line1.end_time = line1.start_time + getduration(line1.text)
-	    line2.start_time = line1.end_time
-	end
+        if line1.text ~= nil then
+            line1.end_time = line1.start_time + getduration(line1.text)
+            line2.start_time = line1.end_time
+        end
 
-	subs[i] = line1
-	subs.insert(i+1, line2)
+        subs[i] = line1
+        subs.insert(i+1, line2)
     end
     aegisub.set_undo_point(tr"Karaoke split")
 end