diff --git a/spectrum/src/frontends/slack/SlackAPI.h b/spectrum/src/frontends/slack/SlackAPI.h
index b5a77aaf2b4073149da42f0b84bc5451bed2ed84..c71d1c54a185d87d8e8bbd2c02f41ccbf1c40b6a 100644
--- a/spectrum/src/frontends/slack/SlackAPI.h
+++ b/spectrum/src/frontends/slack/SlackAPI.h
@@ -84,6 +84,7 @@ class SlackAPI : public HTTPRequestQueue {
 		static void getSlackChannelInfo(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data, std::map<std::string, SlackChannelInfo> &channels);
 		static void getSlackImInfo(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data, std::map<std::string, SlackImInfo> &ims);
 		static void getSlackUserInfo(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data, std::map<std::string, SlackUserInfo> &users);
+		static std::string &SlackObjectToPlainText(std::string &object, bool isChannel = false);
 
 	private:
 		void handleSendMessage(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data);