diff --git a/source3/smbd/scavenger.c b/source3/smbd/scavenger.c
index 5500a9f1565..40b2fe55dcc 100644
--- a/source3/smbd/scavenger.c
+++ b/source3/smbd/scavenger.c
@@ -423,7 +423,7 @@ void scavenger_schedule_disconnected(struct files_struct *fsp)
 		return;
 	}
 	nttime_to_timeval(&disconnect_time, fsp->op->global->disconnect_time);
-	timeout_usec = 1000 * fsp->op->global->durable_timeout_msec;
+	timeout_usec = UINT64_C(1000) * fsp->op->global->durable_timeout_msec;
 	until = timeval_add(&disconnect_time,
 			    timeout_usec / 1000000,
 			    timeout_usec % 1000000);