diff --git a/apisix/cli/schema.lua b/apisix/cli/schema.lua
index 2a758db677a2..36f224b05f31 100644
--- a/apisix/cli/schema.lua
+++ b/apisix/cli/schema.lua
@@ -570,7 +570,7 @@ local config_schema = {
                             type = "string"
                         },
                         client_max_body_size = {
-                            type = "number"
+                            type = "string"
                         },
                         send_timeout = {
                             type = "string"