diff --git a/Changelog b/Changelog
index 8cb98bad..e461635c 100644
--- a/Changelog
+++ b/Changelog
@@ -1,5 +1,5 @@
-Next:
-    * #6561: [hosting] Make monthly invoices available to customers (MR!689)
+2.5.1: 2019-04-17
+    * #6561: [hosting] Preparation for monthly invoices for customers (MR!689)
     *        [logging] Enhance logger, Include timestamp + module name in the logging messages (MR!693)
 2.5: 2019-04-11
     * #6589: [vm creation, listing] Fix obtaining ip address/template related info from oca api call (MR!690, MR!691 and MR!692)
diff --git a/hosting/models.py b/hosting/models.py
index 12ff687c..6e48b503 100644
--- a/hosting/models.py
+++ b/hosting/models.py
@@ -291,7 +291,7 @@ class MonthlyHostingBill(AssignPermissionsMixin, models.Model):
                     "More than one subscriptions"
                     "for MonthlyHostingBill {}".format(args['invoice_id'])
                 )
-                logger.debug("SUB_IDS=".format(','.join(sub_ids)))
+                logger.debug("SUB_IDS={}".format(','.join(sub_ids)))
                 logger.debug("Not importing invoices")
                 return
         elif len(args['lines_meta_data_csv']) > 0:
@@ -303,7 +303,7 @@ class MonthlyHostingBill(AssignPermissionsMixin, models.Model):
                     "More than one VM_ID"
                     "for MonthlyHostingBill {}".format(args['invoice_id'])
                 )
-                logger.debug("VM_IDS=".format(','.join(vm_ids)))
+                logger.debug("VM_IDS={}".format(','.join(vm_ids)))
                 logger.debug("Not importing invoices")
                 return
         else: