Fix build failures

2 files changed, 2 insertions, 2 deletions

diff --git a/lib/e2ee/qolmoutboundsession.cpp b/lib/e2ee/qolmoutboundsession.cpp
index 10b0c4de..76188d08 100644
--- a/lib/e2ee/qolmoutboundsession.cpp
+++ b/lib/e2ee/qolmoutboundsession.cpp
@@ -60,7 +60,7 @@ QOlmExpected<QByteArray> QOlmOutboundGroupSession::pickle(const PicklingMode &mo
     return pickledBuf;
 }
 
-QOlmExpected<QOlmOutboundGroupSessionPtr> QOlmOutboundGroupSession::unpickle(QByteArray &pickled, const PicklingMode &mode)
+QOlmExpected<QOlmOutboundGroupSessionPtr> QOlmOutboundGroupSession::unpickle(const QByteArray &pickled, const PicklingMode &mode)
 {
     QByteArray pickledBuf = pickled;
     auto *olmOutboundGroupSession = olm_outbound_group_session(new uint8_t[olm_outbound_group_session_size()]);
diff --git a/lib/e2ee/qolmoutboundsession.h b/lib/e2ee/qolmoutboundsession.h
index 56b25974..c20613d3 100644
--- a/lib/e2ee/qolmoutboundsession.h
+++ b/lib/e2ee/qolmoutboundsession.h
@@ -25,7 +25,7 @@ public:
     //! Deserialises from encrypted Base64 that was previously obtained by
     //! pickling a `QOlmOutboundGroupSession`.
     static QOlmExpected<QOlmOutboundGroupSessionPtr> unpickle(
-        QByteArray& pickled, const PicklingMode& mode);
+        const QByteArray& pickled, const PicklingMode& mode);
 
     //! Encrypts a plaintext message using the session.
     QOlmExpected<QByteArray> encrypt(const QString& plaintext);