diff --git a/include/linphone/core.h b/include/linphone/core.h
index 55b6fc282..e78ba8e4c 100644
--- a/include/linphone/core.h
+++ b/include/linphone/core.h
@@ -378,6 +378,20 @@ LINPHONE_PUBLIC void linphone_core_cbs_set_message_received(LinphoneCoreCbs *cbs
  */
 LINPHONE_PUBLIC LinphoneCoreCbsMessageReceivedCb linphone_core_cbs_get_message_received(LinphoneCoreCbs *cbs);
 
+/**
+ * Set the #LinphoneCoreCbsMessageReceivedUnableDecryptCb callback.
+ * @param[in] cbs A #LinphoneCoreCbs.
+ * @param[in] cb The callback.
+ */
+LINPHONE_PUBLIC void linphone_core_cbs_set_message_received_unable_decrypt(LinphoneCoreCbs *cbs, LinphoneCoreCbsMessageReceivedUnableDecryptCb cb);
+
+/**
+ * Get the #LinphoneCoreCbsMessageReceivedUnableDecryptCb callback.
+ * @param[in] cbs A #LinphoneCoreCbs.
+ * @return The callback.
+ */
+LINPHONE_PUBLIC LinphoneCoreCbsMessageReceivedUnableDecryptCb linphone_core_cbs_get_message_received_unable_decrypt(LinphoneCoreCbs *cbs);
+
 /**
  * Set the #LinphoneCoreCbsIsComposingReceivedCb callback.
  * @param[in] cbs A #LinphoneCoreCbs.