diff --git a/doc/component/Lexer.markdown b/doc/component/Lexer.markdown
index 06e4192e..0f10afa2 100644
--- a/doc/component/Lexer.markdown
+++ b/doc/component/Lexer.markdown
@@ -100,7 +100,7 @@ class FileLexer extends PhpParser\Lexer {
         // we could use either $startAttributes or $endAttributes here, because the fileName is always the same
         // (regardless of whether it is the start or end token). We choose $endAttributes, because it is slightly
         // more efficient (as the parser has to keep a stack for the $startAttributes).
-        $endAttributes['fileName'] = $fileName;
+        $endAttributes['fileName'] = $this->fileName;
 
         return $tokenId;
     }
@@ -111,4 +111,4 @@ handleHaltCompiler
 ------------------
 
 The method is invoked whenever a `T_HALT_COMPILER` token is encountered. It has to return the remaining string after the
-construct (not including `();`).
\ No newline at end of file
+construct (not including `();`).