diff --git a/include/net/ieee80211_radiotap.h b/include/net/ieee80211_radiotap.h
index c0854933e24f..11630351c978 100644
--- a/include/net/ieee80211_radiotap.h
+++ b/include/net/ieee80211_radiotap.h
@@ -43,6 +43,11 @@ struct ieee80211_radiotap_header {
 	 * @it_present: (first) present word
 	 */
 	__le32 it_present;
+
+	/**
+	 * @it_optional: all remaining presence bitmaps
+	 */
+	__le32 it_optional[];
 } __packed;
 
 /* version is always 0 */
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 3eb7b03b23c6..33c56eab07fc 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -359,7 +359,12 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 
 	put_unaligned_le32(it_present_val, it_present);
 
-	pos = (void *)(it_present + 1);
+	/* This references through an offset into it_optional[] rather
+	 * than via it_present otherwise later uses of pos will cause
+	 * the compiler to think we have walked past the end of the
+	 * struct member.
+	 */
+	pos = (void *)&rthdr->it_optional[it_present - rthdr->it_optional];
 
 	/* the order of the following fields is important */
 
diff --git a/net/wireless/radiotap.c b/net/wireless/radiotap.c
index 8099c9564a59..ae2e1a896461 100644
--- a/net/wireless/radiotap.c
+++ b/net/wireless/radiotap.c
@@ -115,10 +115,9 @@ int ieee80211_radiotap_iterator_init(
 	iterator->_max_length = get_unaligned_le16(&radiotap_header->it_len);
 	iterator->_arg_index = 0;
 	iterator->_bitmap_shifter = get_unaligned_le32(&radiotap_header->it_present);
-	iterator->_arg = (uint8_t *)radiotap_header + sizeof(*radiotap_header);
+	iterator->_arg = (uint8_t *)radiotap_header->it_optional;
 	iterator->_reset_on_ext = 0;
-	iterator->_next_bitmap = &radiotap_header->it_present;
-	iterator->_next_bitmap++;
+	iterator->_next_bitmap = radiotap_header->it_optional;
 	iterator->_vns = vns;
 	iterator->current_namespace = &radiotap_ns;
 	iterator->is_radiotap_ns = 1;