diff --git a/epan/dissectors/packet-ieee802154.h b/epan/dissectors/packet-ieee802154.h
index 82313de746..acbdc5aa84 100644
--- a/epan/dissectors/packet-ieee802154.h
+++ b/epan/dissectors/packet-ieee802154.h
@@ -74,7 +74,7 @@
 #define IEEE802154_SUPERFRAME_ORDER_SHIFT   4
 #define IEEE802154_SUPERFRAME_CAP_SHIFT     8
 
-#define IEEE802154_GTS_COUNT_MASK           0x03
+#define IEEE802154_GTS_COUNT_MASK           0x07
 #define IEEE802154_GTS_PERMIT_MASK          0x80
 #define IEEE802154_GTS_DIRECTION_SLOT(i)    (0x01<<(i))
 #define IEEE802154_GTS_MAX_SLOTS            7