diff --git a/src/network/model/packet-tag-list.h b/src/network/model/packet-tag-list.h
index 3d2301978..a23983e31 100644
--- a/src/network/model/packet-tag-list.h
+++ b/src/network/model/packet-tag-list.h
@@ -158,7 +158,7 @@ public:
      */
     enum TagData_e
     {
-      MAX_SIZE = 20           /**< Size of serialization buffer #data */
+      MAX_SIZE = 21           /**< Size of serialization buffer #data */
   };
 
     uint8_t data[MAX_SIZE];   /**< Serialization buffer */