diff --git a/src/opaque.rs b/src/opaque.rs
index 77d8f56..b52635e 100644
--- a/src/opaque.rs
+++ b/src/opaque.rs
@@ -278,6 +278,9 @@ pub struct ClientRegistrationFinishResult<CS: CipherSuite> {
     /// Instance of the ClientRegistration, only used in tests for checking zeroize
     #[cfg(test)]
     pub state: ClientRegistration<CS>,
+    /// Password derived key, only used in tests
+    #[cfg(test)]
+    pub randomized_pwd: Vec<u8>,
 }
 
 // Cannot be derived because it would require for CS to be Clone.
@@ -289,6 +292,8 @@ impl<CS: CipherSuite> Clone for ClientRegistrationFinishResult<CS> {
             server_s_pk: self.server_s_pk.clone(),
             #[cfg(test)]
             state: self.state.clone(),
+            #[cfg(test)]
+            randomized_pwd: self.randomized_pwd.clone(),
         }
     }
 }
@@ -333,6 +338,8 @@ impl<CS: CipherSuite> ClientRegistration<CS> {
             server_s_pk: r2.server_s_pk,
             #[cfg(test)]
             state: self,
+            #[cfg(test)]
+            randomized_pwd: password_derived_key
         })
     }
 }
diff --git a/src/tests/opaque_test_vectors.rs b/src/tests/opaque_test_vectors.rs
index 22b16a9..139d445 100644
--- a/src/tests/opaque_test_vectors.rs
+++ b/src/tests/opaque_test_vectors.rs
@@ -63,6 +63,7 @@ pub struct TestVectorParameters {
     pub KE3: Vec<u8>,
     pub export_key: Vec<u8>,
     pub session_key: Vec<u8>,
+    pub randomized_pwd: Vec<u8>,
 }
 
 // Pulled from "OPAQUE-3DH Test Vector 1" and "OPAQUE-3DH Test Vector 6"
@@ -482,6 +483,7 @@ fn populate_test_vectors(values: &Value) -> TestVectorParameters {
         blind_login: parse!(values, "blind_login"),
         export_key: parse!(values, "export_key"),
         session_key: parse!(values, "session_key"),
+        randomized_pwd: parse!(values, "randomized_pwd"),
     }
 }
 
@@ -567,6 +569,10 @@ fn test_registration_upload() -> Result<(), ProtocolError> {
             },
         )?;
 
+        assert_eq!(
+            hex::encode(parameters.randomized_pwd),
+            hex::encode(result.randomized_pwd)
+        );
         assert_eq!(
             hex::encode(parameters.registration_upload),
             hex::encode(result.message.serialize())