diff --git a/lib/spec/runner/drb_command_line.rb b/lib/spec/runner/drb_command_line.rb
index cbc0f2d9a..470708bfc 100644
--- a/lib/spec/runner/drb_command_line.rb
+++ b/lib/spec/runner/drb_command_line.rb
@@ -14,7 +14,7 @@ def self.port(options)
       def self.run(options)
         begin
           begin; \
-            DRb.start_service("druby://localhost:0"); \
+            DRb.start_service("druby://127.0.0.1:0"); \
           rescue SocketError, Errno::EADDRNOTAVAIL; \
             DRb.start_service("druby://:0"); \
           end