diff --git a/include/defaults.h b/include/defaults.h
index 7420dd19..b42d776e 100644
--- a/include/defaults.h
+++ b/include/defaults.h
@@ -25,11 +25,11 @@
 #define NTP_TIMEZONEDESCR "Europe/Berlin"
 #define NTP_LONGITUDE 10.4515f
 #define NTP_LATITUDE 51.1657f
-#define NTP_SUNSETTYPE 1
+#define NTP_SUNSETTYPE 1U
 
 #define MQTT_ENABLED false
 #define MQTT_HOST ""
-#define MQTT_PORT 1883
+#define MQTT_PORT 1883U
 #define MQTT_USER ""
 #define MQTT_PASSWORD ""
 #define MQTT_TOPIC "solar/"
@@ -73,13 +73,13 @@
 #define MQTT_LWT_TOPIC "dtu/status"
 #define MQTT_LWT_ONLINE "online"
 #define MQTT_LWT_OFFLINE "offline"
-#define MQTT_PUBLISH_INTERVAL 5
+#define MQTT_PUBLISH_INTERVAL 5U
 
-#define DTU_SERIAL 0x99978563412
-#define DTU_POLL_INTERVAL 5
-#define DTU_NRF_PA_LEVEL 0
+#define DTU_SERIAL 0x99978563412U
+#define DTU_POLL_INTERVAL 5U
+#define DTU_NRF_PA_LEVEL 0U
 #define DTU_CMT_PA_LEVEL 0
-#define DTU_CMT_FREQUENCY 865000
+#define DTU_CMT_FREQUENCY 865000U
 
 #define MQTT_HASS_ENABLED false
 #define MQTT_HASS_EXPIRE true
@@ -91,6 +91,6 @@
 
 #define DISPLAY_POWERSAFE true
 #define DISPLAY_SCREENSAVER true
-#define DISPLAY_ROTATION 2
-#define DISPLAY_CONTRAST 60
-#define DISPLAY_LANGUAGE 0
\ No newline at end of file
+#define DISPLAY_ROTATION 2U
+#define DISPLAY_CONTRAST 60U
+#define DISPLAY_LANGUAGE 0U
\ No newline at end of file