diff --git a/CHANGES b/CHANGES
index 2ee7a6870d..952e607290 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,9 @@
 
+2.3-180 | 2014-09-22 12:52:41 -0500
+
+  * BIT-1259: Fix issue w/ duplicate TCP reassembly deliveries.
+    (Jon Siwek)
+
 2.3-178 | 2014-09-18 14:29:46 -0500
 
   * BIT-1256: Fix file analysis events from coming after bro_done().
diff --git a/VERSION b/VERSION
index b0b576f1ff..1c40e62ee4 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3-178
+2.3-180
diff --git a/src/analyzer/protocol/tcp/TCP_Reassembler.cc b/src/analyzer/protocol/tcp/TCP_Reassembler.cc
index 0ac9078732..921f3a3204 100644
--- a/src/analyzer/protocol/tcp/TCP_Reassembler.cc
+++ b/src/analyzer/protocol/tcp/TCP_Reassembler.cc
@@ -267,7 +267,8 @@ void TCP_Reassembler::Undelivered(uint64 up_to_seq)
 		MatchUndelivered(up_to_seq, false);
 
 	// But we need to re-adjust last_reassem_seq in either case.
-	last_reassem_seq = up_to_seq;	// we've done our best ...
+	if ( up_to_seq > last_reassem_seq )
+		last_reassem_seq = up_to_seq;	// we've done our best ...
 	}
 
 void TCP_Reassembler::MatchUndelivered(uint64 up_to_seq, bool use_last_upper)