diff --git a/src/Root.cpp b/src/Root.cpp
index 9c92a10b9..ad54a075c 100644
--- a/src/Root.cpp
+++ b/src/Root.cpp
@@ -90,7 +90,7 @@ void cRoot::InputThread(cRoot & a_Params)
 			static const std::chrono::microseconds PollPeriod = std::chrono::milliseconds{ 100 };
 
 			timeval Timeout{ 0, 0 };
-			Timeout.tv_usec = PollPeriod.count();
+			Timeout.tv_usec = static_cast<long>(PollPeriod.count());
 
 			fd_set ReadSet;
 			FD_ZERO(&ReadSet);