diff --git a/api/controllers/web/error.py b/api/controllers/web/error.py
index b0192d5494..036e11d5c5 100644
--- a/api/controllers/web/error.py
+++ b/api/controllers/web/error.py
@@ -142,7 +142,7 @@ class InvokeRateLimitError(BaseHTTPException):
 
 
 class NotFoundError(BaseHTTPException):
-    error_code = "unknown"
+    error_code = "not_found"
     code = 404