diff --git a/lldb/unittests/tools/lldb-server/tests/TestClient.cpp b/lldb/unittests/tools/lldb-server/tests/TestClient.cpp
--- a/lldb/unittests/tools/lldb-server/tests/TestClient.cpp
+++ b/lldb/unittests/tools/lldb-server/tests/TestClient.cpp
@@ -79,12 +79,12 @@
 
   Status status;
   TCPSocket listen_socket(true, false);
-  status = listen_socket.Listen("127.0.0.1:0", 5);
+  status = listen_socket.Listen("localhost:0", 5);
   if (status.Fail())
     return status.ToError();
 
   args.AppendArgument(
-      ("127.0.0.1:" + Twine(listen_socket.GetLocalPortNumber())).str());
+      ("localhost:" + Twine(listen_socket.GetLocalPortNumber())).str());
 
   for (StringRef arg : ServerArgs)
     args.AppendArgument(arg);