diff --git a/os/hal/ports/SAMA/LLD/RTCv1/hal_rtc_lld.c b/os/hal/ports/SAMA/LLD/RTCv1/hal_rtc_lld.c
index e408cd77d..174996b8e 100644
--- a/os/hal/ports/SAMA/LLD/RTCv1/hal_rtc_lld.c
+++ b/os/hal/ports/SAMA/LLD/RTCv1/hal_rtc_lld.c
@@ -328,6 +328,10 @@ struct RTCDriverVMT _rtc_lld_vmt = {
  */
 void rtc_lld_init(void) {
 
+#if SAMA_HAL_IS_SECURE
+  mtxConfigPeriphSecurity(MATRIX1, ID_SYSC, SECURE_PER);
+#endif
+
   /* RTC object initialization.*/
   rtcObjectInit(&RTCD0);