diff --git a/Zend/zend_ast.c b/Zend/zend_ast.c
index 5104aad3510e0..26a0cbd16ca51 100644
--- a/Zend/zend_ast.c
+++ b/Zend/zend_ast.c
@@ -1871,7 +1871,7 @@ static ZEND_COLD void zend_ast_export_class_no_header(smart_str *str, zend_ast_d
 	smart_str_appends(str, " {\n");
 	zend_ast_export_stmt(str, decl->child[2], indent + 1);
 	zend_ast_export_indent(str, indent);
-	smart_str_appends(str, "}");
+	smart_str_appendc(str, '}');
 }
 
 static ZEND_COLD void zend_ast_export_attribute_group(smart_str *str, zend_ast *ast, int indent) {
@@ -1899,7 +1899,7 @@ static ZEND_COLD void zend_ast_export_attributes(smart_str *str, zend_ast *ast,
 	for (i = 0; i < list->children; i++) {
 		smart_str_appends(str, "#[");
 		zend_ast_export_attribute_group(str, list->child[i], indent);
-		smart_str_appends(str, "]");
+		smart_str_appendc(str, ']');
 
 		if (newlines) {
 			smart_str_appendc(str, '\n');
@@ -2060,7 +2060,7 @@ static ZEND_COLD void zend_ast_export_ex(smart_str *str, zend_ast *ast, int prio
 		case ZEND_AST_OP_ARRAY:
 			smart_str_appends(str, "Closure(");
 			smart_str_append(str, zend_ast_get_op_array(ast)->op_array->function_name);
-			smart_str_appends(str, ")");
+			smart_str_appendc(str, ')');
 			break;
 		case ZEND_AST_CONSTANT_CLASS:
 			smart_str_appendl(str, "__CLASS__", sizeof("__CLASS__")-1);
@@ -2427,9 +2427,9 @@ static ZEND_COLD void zend_ast_export_ex(smart_str *str, zend_ast *ast, int prio
 		case ZEND_AST_CALL: {
 			zend_ast *left = ast->child[0];
 			if (left->kind == ZEND_AST_ARROW_FUNC || left->kind == ZEND_AST_CLOSURE) {
-				smart_str_appends(str, "(");
+				smart_str_appendc(str, '(');
 				zend_ast_export_ns_name(str, left, 0, indent);
-				smart_str_appends(str, ")");
+				smart_str_appendc(str, ')');
 			} else {
 				zend_ast_export_ns_name(str, left, 0, indent);
 			}
@@ -2679,9 +2679,9 @@ static ZEND_COLD void zend_ast_export_ex(smart_str *str, zend_ast *ast, int prio
 				smart_str_appends(str, " {\n");
 				zend_ast_export_ex(str, ast->child[1], 0, indent + 1);
 				zend_ast_export_indent(str, indent);
-				smart_str_appends(str, "}");
+				smart_str_appendc(str, '}');
 			} else {
-				smart_str_appends(str, ";");
+				smart_str_appendc(str, ';');
 			}
 			break;
 		case ZEND_AST_TRAIT_PRECEDENCE: