diff --git a/SoObjects/SOGo/SOGoGCSFolder.m b/SoObjects/SOGo/SOGoGCSFolder.m
index 9ed312c76..6a996e6c7 100644
--- a/SoObjects/SOGo/SOGoGCSFolder.m
+++ b/SoObjects/SOGo/SOGoGCSFolder.m
@@ -1812,7 +1812,7 @@ static NSArray *childRecordFields = nil;
                 }
               else
                 {
-                  [self errorWithFormat: @"Inconsistency error - got group identifier (%@) from a source (%@) that does not support groups.", uid, [dict objectForKey: @"SOGoSource"]];
+                  [self errorWithFormat: @"Inconsistency error - got group identifier (%@) from a source (%@) that does not support groups (%@).", uid, [dict objectForKey: @"SOGoSource"], NSStringFromClass([source class])];
                   return;
                 }
             }