diff --git a/meson.build b/meson.build
index faf88873..85488965 100644
--- a/meson.build
+++ b/meson.build
@@ -120,6 +120,7 @@ mk22fn512_src = ['platform/mcu/MK22FN512xxx12/boot/startup.c',
                  'platform/mcu/MK22FN512xxx12/boot/libc_integration.c',
                  'platform/mcu/MK22FN512xxx12/drivers/gpio.c',
                  'platform/mcu/MK22FN512xxx12/drivers/delays.c',
+                 'platform/mcu/MK22FN512xxx12/drivers/rtc.c',
                  'platform/mcu/CMSIS/Device/NXP/MK22FN512xxx12/Source/system_MK22F51212.c',
                  'rtos/uC-OS3/Ports/ARM-Cortex-M/ARMv7-M/os_cpu_c.c',
                  'rtos/uC-OS3/Ports/ARM-Cortex-M/ARMv7-M/os_cpu_a.s',