diff --git a/grammar/rebuild.php b/grammar/rebuild.php
index 7292a6c..ef07b0c 100755
--- a/grammar/rebuild.php
+++ b/grammar/rebuild.php
@@ -27,7 +27,7 @@
 $grammarCode = resolveMacros($grammarCode);
 $grammarCode = resolveStackAccess($grammarCode);
 
-$debufFile = null;
+$debugFile = null;
 // $debugFile = fopen(__DIR__ . '/y.phpyacc.out', 'w');
 
 $generator->generate(
@@ -193,4 +193,4 @@ function magicSplit($regex, $string) {
         return [];
     }
     return $pieces;
-}
\ No newline at end of file
+}