diff --git a/tools/thermal/tmon/tui.c b/tools/thermal/tmon/tui.c
index 031b258667d8..7f5dd2b87f15 100644
--- a/tools/thermal/tmon/tui.c
+++ b/tools/thermal/tmon/tui.c
@@ -213,7 +213,7 @@ void show_cooling_device(void)
 		 * cooling device instances. skip unused idr.
 		 */
 		mvwprintw(cooling_device_window, j + 2, 1,
-			"%02d %12.12s%6d %6d",
+			"%02d %12.12s%6lu %6lu",
 			ptdata.cdi[j].instance,
 			ptdata.cdi[j].type,
 			ptdata.cdi[j].cur_state,