diff --git a/src/AppLayer.cpp b/src/AppLayer.cpp
index 30115c4..a8e6a36 100644
--- a/src/AppLayer.cpp
+++ b/src/AppLayer.cpp
@@ -181,11 +181,11 @@ void AppLayer::getPayloadStage1(uint8_t port, LoraEncoder &encoder)
 
 #ifdef RAINDATA_EN
     // Check if time is valid
-    if (*rtcLastClockSync > 0)
+    if (*_rtcLastClockSync > 0)
     {
         // Get local date and time
         struct tm timeinfo;
-        time_t tnow = rtc->getLocalEpoch();
+        time_t tnow = _rtc->getLocalEpoch();
         localtime_r(&tnow, &timeinfo);
 
         // Find weather sensor and determine rain gauge overflow limit
@@ -212,10 +212,10 @@ void AppLayer::getPayloadStage1(uint8_t port, LoraEncoder &encoder)
 
 #ifdef LIGHTNINGSENSOR_EN
     // Check if time is valid
-    if (*rtcLastClockSync > 0)
+    if (*_rtcLastClockSync > 0)
     {
         // Get local date and time
-        time_t tnow = rtc->getLocalEpoch();
+        time_t tnow = _rtc->getLocalEpoch();
 
         // Find lightning sensor
         int ls = weatherSensor.findType(SENSOR_TYPE_LIGHTNING);
diff --git a/src/AppLayer.h b/src/AppLayer.h
index fe761e7..f4f3558 100644
--- a/src/AppLayer.h
+++ b/src/AppLayer.h
@@ -76,8 +76,8 @@
 class AppLayer
 {
 private:
-    ESP32Time *rtc;
-    time_t *rtcLastClockSync;
+    ESP32Time *_rtc;
+    time_t *_rtcLastClockSync;
 
     /// Preferences (stored in flash memory)
     Preferences appPrefs;
@@ -132,8 +132,8 @@ class AppLayer
     AppLayer(ESP32Time *rtc, time_t *clocksync)
 #endif
     {
-        rtc = rtc;
-        rtcLastClockSync = clocksync;
+        _rtc = rtc;
+        _rtcLastClockSync = clocksync;
 
 #if defined(MITHERMOMETER_EN) || defined(THEENGSDECODER_EN)
         knownBLEAddressesDef = KNOWN_BLE_ADDRESSES;