1 files changed, 1 insertions, 1 deletions
diff --git a/lib/net/http.rb b/lib/net/http.rb
index 017a711ee6..dff0d238dd 100644
--- a/lib/net/http.rb
+++ b/lib/net/http.rb
@@ -1297,7 +1297,7 @@ module Net   #:nodoc:
     # See Hash#fetch
     def fetch(key, *args, &block)   #:yield: +key+
       a = @header.fetch(key.downcase, *args, &block)
-      a.join(', ')
+      a.kind_of?(Array) ? a.join(', ') : a
     end
 
     # Iterates for each header names and values.