diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index f0d36435..05511dd3 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -3195,7 +3195,7 @@ def normalize_searching_criteria(criteria)
       return RawData.new(criteria) if criteria.is_a?(String)
       criteria.map {|i|
         if coerce_search_arg_to_seqset?(i)
-          SequenceSet.new(i)
+          SequenceSet[i]
         else
           i
         end