diff --git a/CHANGELOG.md b/CHANGELOG.md
index 721b0c3..cb2553a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- APIs Added
+  - Add ability to retrieve any private key inside a descriptor as bytes [#199]
+
+[#199]: https://github.com/bitcoindevkit/bdk-ffi/pull/199
 
 ## [v0.9.0]
 - Breaking Changes
diff --git a/src/bdk.udl b/src/bdk.udl
index e995080..f1a4429 100644
--- a/src/bdk.udl
+++ b/src/bdk.udl
@@ -283,6 +283,8 @@ interface DescriptorSecretKey {
 
   DescriptorPublicKey as_public();
 
+  sequence<u8> secret_key_bytes();
+
   string as_string();
 };
 
diff --git a/src/lib.rs b/src/lib.rs
index 8f772ca..c7d9972 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -907,6 +907,22 @@ impl DescriptorSecretKey {
         })
     }
 
+    /// Get the private key as bytes.
+    fn secret_key_bytes(&self) -> Vec<u8> {
+        let descriptor_secret_key = self.descriptor_secret_key_mutex.lock().unwrap();
+        let secret_key_bytes: Vec<u8> = match descriptor_secret_key.deref() {
+            BdkDescriptorSecretKey::XPrv(descriptor_x_key) => {
+                descriptor_x_key.xkey.private_key.secret_bytes().to_vec()
+            }
+            BdkDescriptorSecretKey::SinglePriv(descriptor_x_key) => {
+                // unreachable!()
+                descriptor_x_key.key.inner.secret_bytes().to_vec()
+            }
+        };
+
+        secret_key_bytes
+    }
+
     fn as_string(&self) -> String {
         self.descriptor_secret_key_mutex.lock().unwrap().to_string()
     }