diff --git a/lib/drb/drb.rb b/lib/drb/drb.rb
index 36b2b1ade4..a20ee1f143 100644
--- a/lib/drb/drb.rb
+++ b/lib/drb/drb.rb
@@ -953,6 +953,7 @@ module DRb
     # returned by #open or by #accept, then it closes this particular
     # client-server session.
     def close
+      shutdown
       if @socket
         @socket.close
         @socket = nil
diff --git a/lib/drb/unix.rb b/lib/drb/unix.rb
index adc38ff591..7dcf2daaf8 100644
--- a/lib/drb/unix.rb
+++ b/lib/drb/unix.rb
@@ -95,6 +95,7 @@ module DRb
     public
     def close
       return unless @socket
+      shutdown # DRbProtocol#shutdown
       path = @socket.path if @server_mode
       @socket.close
       File.unlink(path) if @server_mode