Fix Windows build

1 files changed, 1 insertions, 1 deletions

diff --git a/include/Olm.hpp b/include/Olm.hpp

index 2730b18c..ae4e0659 100644
--- a/include/Olm.hpp
+++ b/include/Olm.hpp
@@ -41,7 +41,7 @@ client();
 void
 handle_to_device_messages(const std::vector<nlohmann::json> &msgs);
 
-boost::optional<json>
+nlohmann::json
 try_olm_decryption(const std::string &sender_key,
                    const mtx::events::msg::OlmCipherContent &content);