diff --git a/lldb/unittests/Host/MainLoopTest.cpp b/lldb/unittests/Host/MainLoopTest.cpp
--- a/lldb/unittests/Host/MainLoopTest.cpp
+++ b/lldb/unittests/Host/MainLoopTest.cpp
@@ -32,17 +32,13 @@
     ASSERT_TRUE(error.Success());
 
     Socket *accept_socket;
-    std::future<Status> accept_error = std::async(std::launch::async, [&] {
-      return listen_socket_up->Accept(accept_socket);
-    });
-
     std::unique_ptr<TCPSocket> connect_socket_up(
         new TCPSocket(true, child_processes_inherit));
     error = connect_socket_up->Connect(
         llvm::formatv("localhost:{0}", listen_socket_up->GetLocalPortNumber())
             .str());
     ASSERT_TRUE(error.Success());
-    ASSERT_TRUE(accept_error.get().Success());
+    ASSERT_TRUE(listen_socket_up->Accept(accept_socket).Success());
 
     callback_count = 0;
     socketpair[0] = std::move(connect_socket_up);