diff --git a/hci/src/packet_fragmenter.cc b/hci/src/packet_fragmenter.cc
index 7ac4850..3a1175e 100644
--- a/hci/src/packet_fragmenter.cc
+++ b/hci/src/packet_fragmenter.cc
@@ -214,7 +214,8 @@
                  "%s got packet which would exceed expected length of %d. "
                  "Truncating.",
                  __func__, partial_packet->len);
-        packet->len = partial_packet->len - partial_packet->offset;
+        packet->len =
+            (partial_packet->len - partial_packet->offset) + packet->offset;
         projected_offset = partial_packet->len;
       }