diff --git a/Zend/zend.c b/Zend/zend.c
index 20a82902c6c..5672c5c3478 100644
--- a/Zend/zend.c
+++ b/Zend/zend.c
@@ -580,6 +580,7 @@ static void executor_globals_ctor(zend_executor_globals *executor_globals) /* {{
 #ifdef ZEND_WIN32
 	zend_get_windows_version_info(&executor_globals->windows_version_info);
 #endif
+	executor_globals->valid_symbol_table = 0;
 }
 /* }}} */