diff --git a/drivers/unix/os_unix.cpp b/drivers/unix/os_unix.cpp
index 80d7a2ccaa..b3d98a0648 100644
--- a/drivers/unix/os_unix.cpp
+++ b/drivers/unix/os_unix.cpp
@@ -187,7 +187,7 @@ uint64_t OS_Unix::get_system_time_secs() const {
 uint64_t OS_Unix::get_system_time_msecs() const {
 	struct timeval tv_now;
 	gettimeofday(&tv_now, NULL);
-	return uint64_t(tv_now.tv_sec * 1000 + tv_now.tv_usec / 1000);
+	return uint64_t(tv_now.tv_sec) * 1000 + uint64_t(tv_now.tv_usec) / 1000;
 }
 
 OS::Date OS_Unix::get_date(bool utc) const {