diff --git a/examples/mqttc/mqttc_pub.c b/examples/mqttc/mqttc_pub.c
index 6948afb42..9beae6885 100644
--- a/examples/mqttc/mqttc_pub.c
+++ b/examples/mqttc/mqttc_pub.c
@@ -192,13 +192,13 @@ static void parsearg(int argc, FAR char *argv[],
           case 'q':
             switch (strtol(optarg, NULL, 10))
               {
-                case '0':
+                case 0L:
                   cfg->qos = MQTT_PUBLISH_QOS_0;
                   break;
-                case '1':
+                case 1L:
                   cfg->qos = MQTT_PUBLISH_QOS_1;
                   break;
-                case '2':
+                case 2L:
                   cfg->qos = MQTT_PUBLISH_QOS_2;
                   break;
                 }