diff --git a/lib/wallet.py b/lib/wallet.py
index 2cc23265..29aee632 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -735,7 +735,7 @@ class Wallet:
             if tx_height == 0:
                 tx_age = 0
             else: 
-                tx_age = self.verifier.blockchain.height - tx_height + 1
+                tx_age = self.verifier.blockchain.height() - tx_height + 1
             if tx_age > age:
                 age = tx_age
         return age > 2