diff --git a/data/core/doc/highlighter.lua b/data/core/doc/highlighter.lua
index 4cb703da..c77e1138 100644
--- a/data/core/doc/highlighter.lua
+++ b/data/core/doc/highlighter.lua
@@ -52,7 +52,7 @@ end
 function Highlighter:insert_notify(line, n)
   self:invalidate(line)
   for i = 1, n do
-    table.insert(self.lines, line, nil)
+    table.insert(self.lines, line, false)
   end
 end