diff --git a/aprsd/packets/core.py b/aprsd/packets/core.py
index 85a6719..ae9cdb7 100644
--- a/aprsd/packets/core.py
+++ b/aprsd/packets/core.py
@@ -99,6 +99,8 @@ class Packet:
     send_count: int = field(repr=False, default=0, compare=False, hash=False)
     retry_count: int = field(repr=False, default=3, compare=False, hash=False)
     last_send_time: float = field(repr=False, default=0, compare=False, hash=False)
+    # Was the packet acked?
+    acked: bool = field(repr=False, default=False, compare=False, hash=False)
 
     # Do we allow this packet to be saved to send later?
     allow_delay: bool = field(repr=False, default=True, compare=False, hash=False)