diff --git a/arch/arm/src/stm32/stm32f40xxx_rtcc.c b/arch/arm/src/stm32/stm32f40xxx_rtcc.c
index c20024d8b1..ba2426899c 100644
--- a/arch/arm/src/stm32/stm32f40xxx_rtcc.c
+++ b/arch/arm/src/stm32/stm32f40xxx_rtcc.c
@@ -1026,6 +1026,10 @@ int up_rtc_initialize(void)
 
   stm32_exti_alarm(true, false, true, stm32_rtc_alarm_handler);
   rtc_dumpregs("After InitExtiAlarm");
+
+  /* Enable RTC Alarm interrupts */
+
+  up_enable_irq(STM32_IRQ_RTCALRM);
 #else
   rtc_dumpregs("After Initialization");
 #endif