diff --git a/src/SyncClient.cpp b/src/SyncClient.cpp
index 7625514..ef042f7 100644
--- a/src/SyncClient.cpp
+++ b/src/SyncClient.cpp
@@ -147,7 +147,7 @@ const std::string strip_and_resolve_addresses(std::string const& address) {
   return "ipv4:///" + stripped_address;
 }
 
-const bool authenticate(std::shared_ptr<grpc::Channel> const& channel,
+bool authenticate(std::shared_ptr<grpc::Channel> const& channel,
                         std::string const& username,
                         std::string const& password,
                         std::string& token_or_message) {