diff --git a/apisix/schema_def.lua b/apisix/schema_def.lua
index d8b62088476c..04b6c49c0189 100644
--- a/apisix/schema_def.lua
+++ b/apisix/schema_def.lua
@@ -104,7 +104,7 @@ local labels_def = {
 
 local rule_name_def = {
     type = "string",
-    maxLength = 100,
+    maxLength = 256,
     minLength = 1,
 }
 
diff --git a/t/admin/services.t b/t/admin/services.t
index 90a5e9271a0f..6d244efac2c1 100644
--- a/t/admin/services.t
+++ b/t/admin/services.t
@@ -1227,7 +1227,7 @@ qr/\{"error_msg":"the property is forbidden:.*"\}/
         content_by_lua_block {
             local t = require("lib.test_admin").test
             local code, body = t('/apisix/admin/services/1', ngx.HTTP_PUT,
-                require("toolkit.json").encode({name = ("1"):rep(101)}))
+                require("toolkit.json").encode({name = ("1"):rep(257)}))
 
             ngx.status = code
             ngx.print(body)
@@ -1237,7 +1237,7 @@ qr/\{"error_msg":"the property is forbidden:.*"\}/
 GET /t
 --- error_code: 400
 --- response_body
-{"error_msg":"invalid configuration: property \"name\" validation failed: string too long, expected at most 100, got 101"}
+{"error_msg":"invalid configuration: property \"name\" validation failed: string too long, expected at most 256, got 257"}