diff --git a/packages/api/src/clients/trading/api.json b/packages/api/src/clients/trading/api.json
index a52daa129f1..eb8e4c5c53f 100644
--- a/packages/api/src/clients/trading/api.json
+++ b/packages/api/src/clients/trading/api.json
@@ -7647,8 +7647,7 @@
               },
               "signature": {
                 "type": "string",
-                "description": "The signature for a message signing step.",
-                "pattern": "^0x[a-fA-F0-9]{130}$"
+                "description": "The signature for a message signing step."
               }
             }
           }