diff --git a/bdk-ffi/src/bdk.udl b/bdk-ffi/src/bdk.udl
index 3a34b85f..89eaeca6 100644
--- a/bdk-ffi/src/bdk.udl
+++ b/bdk-ffi/src/bdk.udl
@@ -405,6 +405,9 @@ interface Wallet {
   [Throws=SignerError]
   boolean sign(Psbt psbt);
 
+  [Throws=SignerError]
+  boolean finalize_psbt(Psbt psbt);
+
   SentAndReceivedValues sent_and_received([ByRef] Transaction tx);
 
   sequence<CanonicalTx> transactions();
diff --git a/bdk-ffi/src/wallet.rs b/bdk-ffi/src/wallet.rs
index 16409a1d..bdb506d0 100644
--- a/bdk-ffi/src/wallet.rs
+++ b/bdk-ffi/src/wallet.rs
@@ -144,6 +144,13 @@ impl Wallet {
             .map_err(SignerError::from)
     }
 
+    pub fn finalize_psbt(&self, psbt: Arc<Psbt>) -> Result<bool, SignerError> {
+        let mut psbt = psbt.0.lock().unwrap();
+        self.get_wallet()
+            .finalize_psbt(&mut psbt, SignOptions::default())
+            .map_err(SignerError::from)
+    }
+
     pub fn sent_and_received(&self, tx: &Transaction) -> SentAndReceivedValues {
         let (sent, received) = self.get_wallet().sent_and_received(&tx.into());
         SentAndReceivedValues {