diff --git a/CHANGELOG.md b/CHANGELOG.md
index d59b3c2ab..02547ddaa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ All notable changes to this project will be documented in this file.
 ### Changed
 
 ### Fixed
+- RTC not detected when lights are present (#16242)
 
 ### Removed
 
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 55b229890..2c969570f 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -115,5 +115,6 @@ The latter links can be used for OTA upgrades too like ``OtaUrl http://ota.tasmo
 ### Changed
 
 ### Fixed
+- RTC not detected when lights are present [#16242](https://github.com/arendst/Tasmota/issues/16242)
 
 ### Removed
diff --git a/tasmota/include/tasmota.h b/tasmota/include/tasmota.h
index 6284b9c29..0ec8fa05f 100644
--- a/tasmota/include/tasmota.h
+++ b/tasmota/include/tasmota.h
@@ -371,7 +371,7 @@ enum LightSubtypes { LST_NONE, LST_SINGLE, LST_COLDWARM, LST_RGB,   LST_RGBW, LS
 enum LightTypes    { LT_BASIC, LT_PWM1,    LT_PWM2,      LT_PWM3,   LT_PWM4,  LT_PWM5,  LT_PWM6, LT_PWM7,
                      LT_NU8,   LT_SERIAL1, LT_SERIAL2,   LT_RGB,    LT_RGBW,  LT_RGBWC, LT_NU14, LT_NU15 };  // Do not insert new fields
 
-enum XsnsFunctions {FUNC_SETTINGS_OVERRIDE, FUNC_PIN_STATE, FUNC_MODULE_INIT, FUNC_PRE_INIT, FUNC_INIT,
+enum XsnsFunctions {FUNC_SETTINGS_OVERRIDE, FUNC_PIN_STATE, FUNC_I2C_INIT, FUNC_MODULE_INIT, FUNC_PRE_INIT, FUNC_INIT,
                     FUNC_LOOP, FUNC_EVERY_50_MSECOND, FUNC_EVERY_100_MSECOND, FUNC_EVERY_200_MSECOND, FUNC_EVERY_250_MSECOND, FUNC_EVERY_SECOND,
                     FUNC_SAVE_SETTINGS, FUNC_SAVE_AT_MIDNIGHT, FUNC_SAVE_BEFORE_RESTART,
                     FUNC_AFTER_TELEPERIOD, FUNC_JSON_APPEND, FUNC_WEB_SENSOR, FUNC_WEB_COL_SENSOR, FUNC_COMMAND, FUNC_COMMAND_SENSOR, FUNC_COMMAND_DRIVER,
diff --git a/tasmota/tasmota_support/support_tasmota.ino b/tasmota/tasmota_support/support_tasmota.ino
index ef88dc674..5ae999266 100644
--- a/tasmota/tasmota_support/support_tasmota.ino
+++ b/tasmota/tasmota_support/support_tasmota.ino
@@ -2173,6 +2173,8 @@ void GpioInit(void)
 #endif
 #endif  // USE_I2C
 
+  XdrvCall(FUNC_I2C_INIT);                                 // Init RTC
+
   TasmotaGlobal.devices_present = 0;
   TasmotaGlobal.light_type = LT_BASIC;                     // Use basic PWM control if SetOption15 = 0
 
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_56_rtc_chips.ino b/tasmota/tasmota_xdrv_driver/xdrv_56_rtc_chips.ino
index ac3c31c2d..0de267656 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_56_rtc_chips.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_56_rtc_chips.ino
@@ -446,7 +446,7 @@ bool Xdrv56(uint8_t function) {
   }
 #endif  // RTC_NTP_SERVER
 
-  if (FUNC_MODULE_INIT == function) {
+  if (FUNC_I2C_INIT == function) {
     RtcChipDetect();
   }
   else if (RtcChip.detected) {