diff --git a/cloudkitty/api/v2/task/reprocess.py b/cloudkitty/api/v2/task/reprocess.py
index 197bb298..2d6deef0 100644
--- a/cloudkitty/api/v2/task/reprocess.py
+++ b/cloudkitty/api/v2/task/reprocess.py
@@ -286,10 +286,14 @@ class ReprocessSchedulerGetApi(base.BaseResource):
         if not isinstance(scope_ids, list):
             scope_ids = [scope_ids]
 
+        # Some versions of python-cloudkittyclient can send the order in upper
+        # case, e.g. "DESC". Convert it to lower case for compatibility.
+        order = order.lower()
+
         if order not in ACCEPTED_GET_REPROCESSING_REQUEST_ORDERS:
             raise http_exceptions.BadRequest(
-                "The order [%s] is not valid. Accepted values are %s.",
-                order, ACCEPTED_GET_REPROCESSING_REQUEST_ORDERS)
+                "The order [%s] is not valid. Accepted values are %s." %
+                (order, ACCEPTED_GET_REPROCESSING_REQUEST_ORDERS))
 
         schedules = self.schedule_reprocessing_db.get_all(
             identifier=scope_ids, remove_finished=False,
diff --git a/releasenotes/notes/reprocess-get-fix-f2bd1f2f9e2d640e.yaml b/releasenotes/notes/reprocess-get-fix-f2bd1f2f9e2d640e.yaml
new file mode 100644
index 00000000..e3b9c945
--- /dev/null
+++ b/releasenotes/notes/reprocess-get-fix-f2bd1f2f9e2d640e.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix retrieval of reprocessing tasks which was returning ``Internal Server
+    Error``.