diff --git a/src/STM32LoRaWAN.cpp b/src/STM32LoRaWAN.cpp
index 433acb9..bc91055 100644
--- a/src/STM32LoRaWAN.cpp
+++ b/src/STM32LoRaWAN.cpp
@@ -75,7 +75,6 @@ bool STM32LoRaWAN::begin(_lora_band band)
   _rtc.begin(true, STM32RTC::HOUR_24);
   /* Attach the callback function before enabling Interrupt */
   _rtc.attachInterrupt(UTIL_TIMER_IRQ_MAP_PROCESS, STM32RTC::ALARM_B);
-  _rtc.attachSecondsInterrupt(TIMER_IF_SSRUCallback);
   /* The subsecond alarm B is set during the StartTimerEvent */
 
   UTIL_TIMER_Init(_rtc.getHandle());