diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index 062ed8b025916..481bbc877a0af 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -6465,7 +6465,7 @@ void zend_compile_func_decl(znode *result, zend_ast *ast, zend_bool toplevel) /*
 	}
 
 	zend_compile_params(params_ast, return_type_ast,
-		is_method && zend_string_equals_literal_ci(decl->name, "__toString") ? IS_STRING : 0);
+		is_method && zend_string_equals_literal(method_lcname, ZEND_TOSTRING_FUNC_NAME) ? IS_STRING : 0);
 	if (CG(active_op_array)->fn_flags & ZEND_ACC_GENERATOR) {
 		zend_mark_function_as_generator();
 		zend_emit_op(NULL, ZEND_GENERATOR_CREATE, NULL, NULL);