diff --git a/open-api/rest-catalog-open-api.py b/open-api/rest-catalog-open-api.py
index e72e07e15d42..3bc8574e0cd5 100644
--- a/open-api/rest-catalog-open-api.py
+++ b/open-api/rest-catalog-open-api.py
@@ -464,7 +464,7 @@ class IcebergErrorResponse(BaseModel):
     class Config:
         extra = Extra.forbid
 
-    error: Optional[ErrorModel] = None
+    error: ErrorModel
 
 
 class CreateNamespaceResponse(BaseModel):
diff --git a/open-api/rest-catalog-open-api.yaml b/open-api/rest-catalog-open-api.yaml
index f9d76ff3c9f9..29f06ffc746c 100644
--- a/open-api/rest-catalog-open-api.yaml
+++ b/open-api/rest-catalog-open-api.yaml
@@ -2323,6 +2323,8 @@ components:
 
     IcebergErrorResponse:
       type: object
+      required:
+        - error
       properties:
         error:
           $ref: '#/components/schemas/ErrorModel'