diff --git a/asio/include/asio/detail/impl/win_mutex.ipp b/asio/include/asio/detail/impl/win_mutex.ipp
index 6340b6e125..637f420b62 100644
--- a/asio/include/asio/detail/impl/win_mutex.ipp
+++ b/asio/include/asio/detail/impl/win_mutex.ipp
@@ -52,7 +52,7 @@ int win_mutex::do_init()
 # endif
   return 0;
 #else
-  __try
+  try
   {
 # if defined(UNDER_CE)
     ::InitializeCriticalSection(&crit_section_);
@@ -64,7 +64,7 @@ int win_mutex::do_init()
       return ::GetLastError();
 # endif
   }
-  __except(GetExceptionCode() == STATUS_NO_MEMORY
+  except(GetExceptionCode() == STATUS_NO_MEMORY
       ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
   {
     return ERROR_OUTOFMEMORY;
diff --git a/asio/include/asio/detail/impl/win_static_mutex.ipp b/asio/include/asio/detail/impl/win_static_mutex.ipp
index 5b45984333..309aba0e90 100644
--- a/asio/include/asio/detail/impl/win_static_mutex.ipp
+++ b/asio/include/asio/detail/impl/win_static_mutex.ipp
@@ -89,7 +89,7 @@ int win_static_mutex::do_init()
   }
 # endif
 #else
-  __try
+  try
   {
 # if defined(UNDER_CE)
     ::InitializeCriticalSection(&crit_section_);
@@ -111,7 +111,7 @@ int win_static_mutex::do_init()
     }
 # endif
   }
-  __except(GetExceptionCode() == STATUS_NO_MEMORY
+  except(GetExceptionCode() == STATUS_NO_MEMORY
       ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
   {
     ::ReleaseMutex(mutex);