diff --git a/lib/wallet.py b/lib/wallet.py
index cc5074eb..dd4ec66a 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -528,7 +528,7 @@ class Wallet:
             else:
                 n += 1
                 if n > nmax: nmax = n
-        return nmax
+        return nmax + 1
 
 
     def synchronize(self):