diff --git a/chainntnfs/txnotifier.go b/chainntnfs/txnotifier.go
index e3f3c4e1..84bd55e1 100644
--- a/chainntnfs/txnotifier.go
+++ b/chainntnfs/txnotifier.go
@@ -10,6 +10,15 @@ import (
 	"github.com/btcsuite/btcutil"
 )
 
+const (
+	// ReorgSafetyLimit is the chain depth beyond which it is assumed a
+	// block will not be reorganized out of the chain. This is used to
+	// determine when to prune old confirmation requests so that reorgs are
+	// handled correctly. The average number of blocks in a day is a
+	// reasonable value to use.
+	ReorgSafetyLimit = 144
+)
+
 var (
 	// ErrTxNotifierExiting is an error returned when attempting to interact
 	// with the TxNotifier but it been shut down.