diff --git a/lib/wallet.py b/lib/wallet.py
index 56037f0d1..3ee2cfd74 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -1141,7 +1141,7 @@ class Abstract_Wallet(object):
     def is_used(self, address):
         h = self.history.get(address,[])
         c, u, x = self.get_addr_balance(address)
-        return len(h), len(h) > 0 and c == -u
+        return len(h), len(h) > 0 and c + u + x == 0
 
     def is_empty(self, address):
         c, u, x = self.get_addr_balance(address)