diff --git a/lib/tftp.c b/lib/tftp.c
index f2cd3fb01..da250fca8 100644
--- a/lib/tftp.c
+++ b/lib/tftp.c
@@ -205,7 +205,7 @@ void tftp_set_timeouts(tftp_state_data_t *state)
   else {
 
     /* Compute drop-dead time */
-    maxtime = data->set.timeout?data->set.timeout:3600;
+    maxtime = (time_t)(data->set.timeout?data->set.timeout:3600);
     state->max_time = state->start_time+maxtime;
 
     /* Set per-block timeout to 10% of total */