diff --git a/include/boost/process/detail/windows/wait_group.hpp b/include/boost/process/detail/windows/wait_group.hpp
index 33e353f9..ebd78e3b 100644
--- a/include/boost/process/detail/windows/wait_group.hpp
+++ b/include/boost/process/detail/windows/wait_group.hpp
@@ -48,7 +48,7 @@ inline bool wait_impl(const group_handle & p, std::error_code & ec, std::chrono:
                 return false; //correct, nothing left.
         }
         //reduce the remaining wait time -> in case interrupted by something else
-        if (wait_time != ::boost::winapi::infinite)
+        if (wait_time != static_cast<int>(::boost::winapi::infinite))
         {
             auto now = std::chrono::system_clock::now();
             auto diff = std::chrono::duration_cast<std::chrono::milliseconds>(now - start_time);