diff --git a/modules/Bio/EnsEMBL/Utils/Argument.pm b/modules/Bio/EnsEMBL/Utils/Argument.pm
index 4a86a0d9a5d9b5ca110cea8dba7b7f13ed09baac..2f3cc69dec9f3c4438d3bb3d135c40c4c7d7a327 100644
--- a/modules/Bio/EnsEMBL/Utils/Argument.pm
+++ b/modules/Bio/EnsEMBL/Utils/Argument.pm
@@ -131,7 +131,7 @@ sub rearrange {
   # What we intend to do is loop through the @{$order} variable,
   # and for each value, we use that as a key into our associative
   # array, pushing the value at that key onto our return array.
-  return map {$param{uc("-$_")} || $param{uc($_)}} @$order;
+  return map {$param{uc("-$_")}} @$order;
 }
 
 1;