diff --git a/components/ieee802154/private_include/esp_ieee802154_dev.h b/components/ieee802154/private_include/esp_ieee802154_dev.h
index 221c2c32be..1d53af66f0 100644
--- a/components/ieee802154/private_include/esp_ieee802154_dev.h
+++ b/components/ieee802154/private_include/esp_ieee802154_dev.h
@@ -268,7 +268,7 @@ bool ieee802154_mac_is_inited(void);
 #define IEEE802154_STATIC  static
 #define IEEE802154_INLINE  inline
 #endif // CONFIG_IEEE802154_TEST
-#define IEEE802154_NOINLINE __attribute__((noinline))
+#define IEEE802154_NOINLINE __attribute__((noinline, used))
 
 #ifdef __cplusplus
 }
diff --git a/components/openthread/src/port/esp_openthread_radio.c b/components/openthread/src/port/esp_openthread_radio.c
index 1d3f38d0a6..6ddee9aa74 100644
--- a/components/openthread/src/port/esp_openthread_radio.c
+++ b/components/openthread/src/port/esp_openthread_radio.c
@@ -658,7 +658,7 @@ esp_err_t IRAM_ATTR esp_ieee802154_enh_ack_generator(uint8_t *frame, esp_ieee802
 {
     otRadioFrame ack_frame;
     otRadioFrame ot_frame;
-    uint8_t ack_ie_data[OT_ACK_IE_MAX_SIZE];
+    uint8_t ack_ie_data[OT_ACK_IE_MAX_SIZE] = {0};
     uint8_t offset = 0;
 #if OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE
     uint8_t link_metrics_data_len = 0;