diff --git a/src/utils/monero_utils.h b/src/utils/monero_utils.h
index 8308262..8408510 100644
--- a/src/utils/monero_utils.h
+++ b/src/utils/monero_utils.h
@@ -83,6 +83,8 @@ namespace monero_utils
 
   /**
    * Add number, string, and boolean json members using template specialization.
+   *
+   * TODO: addJsonMember("key", "val", ...) treated as integer instead of string literal
    */
   template <class T>
   void addJsonMember(std::string key, T val, rapidjson::Document::AllocatorType& allocator, rapidjson::Value& root, rapidjson::Value& field) {
diff --git a/src/wallet/monero_wallet_model.cpp b/src/wallet/monero_wallet_model.cpp
index 71678d9..cec5537 100644
--- a/src/wallet/monero_wallet_model.cpp
+++ b/src/wallet/monero_wallet_model.cpp
@@ -1285,7 +1285,7 @@ namespace monero {
 
     // set string values
     rapidjson::Value value_str(rapidjson::kStringType);
-    monero_utils::addJsonMember("signatureType", m_signature_type == monero_message_signature_type::SIGN_WITH_SPEND_KEY ? "spend" : "view", allocator, root, value_str);
+    monero_utils::addJsonMember("signatureType", m_signature_type == monero_message_signature_type::SIGN_WITH_SPEND_KEY ? std::string("spend") : std::string("view"), allocator, root, value_str);
 
     // return root
     return root;