diff --git a/lib/net/protocol.rb b/lib/net/protocol.rb
index e6994477b8..7ec636b384 100644
--- a/lib/net/protocol.rb
+++ b/lib/net/protocol.rb
@@ -211,7 +211,7 @@ module Net # :nodoc:
 
     def write(*strs)
       writing {
-        write0 *strs
+        write0(*strs)
       }
     end