diff --git a/ports/mimxrt/machine_rtc.c b/ports/mimxrt/machine_rtc.c
index 294942cf5a..6d86c07b75 100644
--- a/ports/mimxrt/machine_rtc.c
+++ b/ports/mimxrt/machine_rtc.c
@@ -156,8 +156,11 @@ void machine_rtc_start(void) {
     SNVS->HPCOMR |= SNVS_HPCOMR_NPSWA_EN_MASK;
     // Do a basic init.
     SNVS_LP_Init(SNVS);
+
+    #if defined(FSL_FEATURE_SNVS_HAS_MULTIPLE_TAMPER) && (FSL_FEATURE_SNVS_HAS_MULTIPLE_TAMPER > 0)
     // Disable all external Tamper
     SNVS_LP_DisableAllExternalTamper(SNVS);
+    #endif
 
     SNVS_LP_SRTC_StartTimer(SNVS);
     // If the date is not set, set it to a more recent start date,