diff --git a/lib/wallet.py b/lib/wallet.py
index a5cbf3c5..c9acd221 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -1443,9 +1443,6 @@ class Imported_Wallet(Simple_Wallet):
     def is_deterministic(self):
         return False
 
-    def is_used(self, address):
-        return False
-
     def is_change(self, address):
         return False