diff --git a/examples/zolertia/zoul/zoul-demo.c b/examples/zolertia/zoul/zoul-demo.c
index 127c18d50..a88e7c48c 100644
--- a/examples/zolertia/zoul/zoul-demo.c
+++ b/examples/zolertia/zoul/zoul-demo.c
@@ -108,7 +108,7 @@ broadcast_recv(struct broadcast_conn *c, const linkaddr_t *from)
 static const struct broadcast_callbacks bc_rx = { broadcast_recv };
 static struct broadcast_conn bc;
 /*---------------------------------------------------------------------------*/
-void
+static void
 rt_callback(struct rtimer *t, void *ptr)
 {
   leds_off(LEDS_PERIODIC);
diff --git a/platform/zoul/dev/weather-meter.c b/platform/zoul/dev/weather-meter.c
index 933fc975d..8d3ee07f1 100644
--- a/platform/zoul/dev/weather-meter.c
+++ b/platform/zoul/dev/weather-meter.c
@@ -185,7 +185,7 @@ weather_meter_get_wind_dir(void)
   return weather_meter_wind_vane_degrees(weather_sensors.wind_vane);
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 rt_callback(struct rtimer *t, void *ptr)
 {
   uint32_t wind_speed;
@@ -223,7 +223,7 @@ rt_callback(struct rtimer *t, void *ptr)
 
   /* Calculate the 2 minute average */
   if(!(anemometer.ticks_avg % WEATHER_METER_AVG_PERIOD)) {
-    PRINTF("Weather: calculate the %u averages ***\n", WEATHER_METER_AVG_PERIOD);
+    PRINTF("\nWeather: calculate the %u averages ***\n", WEATHER_METER_AVG_PERIOD);
 
     if(anemometer.value_buf_xm) {
       anemometer.value_avg_xm = anemometer.value_buf_xm / WEATHER_METER_AVG_PERIOD;