diff --git a/src/authres.rs b/src/authres.rs
index 55a3dc636..51f7eb9fa 100644
--- a/src/authres.rs
+++ b/src/authres.rs
@@ -357,6 +357,7 @@ mod tests {
 
     use super::*;
 
+    use crate::aheader::EncryptPreference;
     use crate::e2ee;
     use crate::mimeparser;
     use crate::peerstate::Peerstate;
@@ -686,6 +687,9 @@ Authentication-Results: box.hispanilandia.net; spf=pass smtp.mailfrom=adbenitez@
             .await?
             .unwrap();
 
+        // Encryption preference is still mutual.
+        assert_eq!(bob_state.prefer_encrypt, EncryptPreference::Mutual);
+
         // Also check that the keypair was not changed
         assert_eq!(
             bob_state.public_key.unwrap(),