diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 8a44a70..c248e84 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -119,7 +119,7 @@ set_property(
 if (MSVC)
     set(
         UMB_ECHO_SERVER_COMPILE_OPTIONS
-        /await
+        /await:strict
     )
 else ()
     set(
diff --git a/tests/umb_echo_server.cpp b/tests/umb_echo_server.cpp
index 864cabb..558909a 100644
--- a/tests/umb_echo_server.cpp
+++ b/tests/umb_echo_server.cpp
@@ -22,6 +22,19 @@
  *
  */
 
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__)
+
+#define WINDOWS 1
+
+// Silence "Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately".
+#include <SDKDDKVer.h>
+
+#else
+
+#define WINDOWS 0
+
+#endif
+
 #include <format>
 #include <iostream>
 #include <memory>
@@ -79,7 +92,11 @@ awaitable<void> echo(tcp::socket socket)
 
             const auto type = static_cast<testmessages::umb::MessageType>(
                 data[2] | (data[3] << 8));
+#if WINDOWS
+            const auto mt_str = std::to_string(static_cast<uint16_t>(type));
+#else
             const auto mt_str = testmessages::umb::meta::to_string(type);
+#endif
             std::cout << std::format("type: {}\n", mt_str);
 
             const auto payload = std::span<umb::byte>{data.data(), size};