diff --git a/Zend/zend_ast.h b/Zend/zend_ast.h
index 999dfd3c6c2..5165925696f 100644
--- a/Zend/zend_ast.h
+++ b/Zend/zend_ast.h
@@ -187,7 +187,7 @@ typedef struct _zend_ast_decl {
 } zend_ast_decl;
 
 typedef void (*zend_ast_process_t)(zend_ast *ast);
-extern zend_ast_process_t zend_ast_process;
+extern ZEND_API zend_ast_process_t zend_ast_process;
 
 ZEND_API zend_ast *zend_ast_create_zval_ex(zval *zv, zend_ast_attr attr);