diff --git a/tools/thermal/tmon/tmon.c b/tools/thermal/tmon/tmon.c
index 7eb3216a27f4..ef67cd1a4861 100644
--- a/tools/thermal/tmon/tmon.c
+++ b/tools/thermal/tmon/tmon.c
@@ -171,7 +171,7 @@ static void prepare_logging(void)
 
 		memset(binding_str, 0, sizeof(binding_str));
 		for (j = 0; j < 32; j++)
-			binding_str[j] = (ptdata.tzi[i].cdev_binding & (1 << j)) ?
+			binding_str[j] = (ptdata.tzi[i].cdev_binding & (1U << j)) ?
 				'1' : '0';
 
 		fprintf(tmon_log, "#thermal zone %s%02d cdevs binding: %32s\n",