diff --git a/src/galaxy/api/errors.py b/src/galaxy/api/errors.py
index d5411d6..fca141e 100644
--- a/src/galaxy/api/errors.py
+++ b/src/galaxy/api/errors.py
@@ -23,16 +23,16 @@ class BackendError(ApplicationError):
         super().__init__(4, message, data)
 
 
-class UnknownBackendResponse(ApplicationError):
-    def __init__(self, message="Backend responded in unknown way", data=None):
-        super().__init__(4, message, data)
-
-
 class TooManyRequests(ApplicationError):
     def __init__(self, message="Too many requests. Try again later", data=None):
         super().__init__(5, message, data)
 
 
+class UnknownBackendResponse(ApplicationError):
+    def __init__(self, message="Backend responded in unknown way", data=None):
+        super().__init__(6, message, data)
+
+
 class InvalidCredentials(ApplicationError):
     def __init__(self, message="Invalid credentials", data=None):
         super().__init__(100, message, data)