diff --git a/src/Php/Constants.php b/src/Php/Constants.php
index 5e60c78a..3cffc5a1 100644
--- a/src/Php/Constants.php
+++ b/src/Php/Constants.php
@@ -64,6 +64,7 @@ class Constants
 
     public const array UNSUPPORTED_FUNCTIONS = [
         'extract',
+        'get_defined_vars',
     ];
 
     public const array COMPILER_OPTIONS = [