diff --git a/components/ieee802154/driver/esp_ieee802154_ack.c b/components/ieee802154/driver/esp_ieee802154_ack.c
index 1a94a58b22..cb21dd72a0 100644
--- a/components/ieee802154/driver/esp_ieee802154_ack.c
+++ b/components/ieee802154/driver/esp_ieee802154_ack.c
@@ -17,7 +17,7 @@
 
 static ieee802154_pending_table_t ieee802154_pending_table;
 
-#define GET_MASK_ITEM_FROM_TABLE(mask, pos) (mask[(pos + 1) / IEEE802154_PENDING_TABLE_MASK_BITS])
+#define GET_MASK_ITEM_FROM_TABLE(mask, pos) (mask[(pos) / IEEE802154_PENDING_TABLE_MASK_BITS])
 
 #define BIT_SET(mask, pos) (GET_MASK_ITEM_FROM_TABLE(mask, pos) |= (1UL << (pos % IEEE802154_PENDING_TABLE_MASK_BITS)))
 #define BIT_CLR(mask, pos) (GET_MASK_ITEM_FROM_TABLE(mask, pos) &= ~(1UL << (pos % IEEE802154_PENDING_TABLE_MASK_BITS)))
diff --git a/components/ieee802154/private_include/esp_ieee802154_ack.h b/components/ieee802154/private_include/esp_ieee802154_ack.h
index 793600b91d..2910a561b4 100644
--- a/components/ieee802154/private_include/esp_ieee802154_ack.h
+++ b/components/ieee802154/private_include/esp_ieee802154_ack.h
@@ -21,7 +21,7 @@ extern "C" {
  */
 
 #define IEEE802154_PENDING_TABLE_MASK_BITS (8)
-#define IEEE802154_PENDING_TABLE_MASK_SIZE ((CONFIG_IEEE802154_PENDING_TABLE_SIZE + 1) / IEEE802154_PENDING_TABLE_MASK_BITS)
+#define IEEE802154_PENDING_TABLE_MASK_SIZE (((CONFIG_IEEE802154_PENDING_TABLE_SIZE - 1) / IEEE802154_PENDING_TABLE_MASK_BITS) + 1)
 typedef struct {
     uint8_t short_addr[CONFIG_IEEE802154_PENDING_TABLE_SIZE][IEEE802154_FRAME_SHORT_ADDR_SIZE]; /*!< Short address table */
     uint8_t ext_addr[CONFIG_IEEE802154_PENDING_TABLE_SIZE][IEEE802154_FRAME_EXT_ADDR_SIZE];     /*!< Extend address table */