diff --git a/src/bdk.udl b/src/bdk.udl
index e3ab62e..c5cd9a2 100644
--- a/src/bdk.udl
+++ b/src/bdk.udl
@@ -90,6 +90,7 @@ interface OfflineWallet {
 
   // OfflineWalletOperations
   string get_new_address();
+  string get_last_unused_address();
   [Throws=BdkError]
   u64 get_balance();
   [Throws=BdkError]
@@ -130,6 +131,7 @@ interface OnlineWallet {
 
   // OfflineWalletOperations
   string get_new_address();
+  string get_last_unused_address();
   [Throws=BdkError]
   u64 get_balance();
   [Throws=BdkError]
diff --git a/src/lib.rs b/src/lib.rs
index e19ab21..f1892f2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -89,6 +89,14 @@ trait OfflineWalletOperations<B>: WalletHolder<B> {
             .to_string()
     }
 
+    fn get_last_unused_address(&self) -> String {
+        self.get_wallet()
+            .get_address(AddressIndex::LastUnused)
+            .unwrap()
+            .address
+            .to_string()
+    }
+
     fn get_balance(&self) -> Result<u64, Error> {
         self.get_wallet().get_balance()
     }