diff --git a/twrp-functions.hpp b/twrp-functions.hpp
index de14d94..1cc531c 100644
--- a/twrp-functions.hpp
+++ b/twrp-functions.hpp
@@ -86,6 +86,7 @@
 	static bool Create_Dir_Recursive(const std::string& path, mode_t mode = 0755, uid_t uid = -1, gid_t gid = -1);  // Create directory and it's parents, if they don't exist. mode, uid and gid are set to all _newly_ created folders. If whole path exists, do nothing.
 	static int Set_Brightness(std::string brightness_value); // Well, you can read, it does what it says, passing return int from TWFunc::Write_File ;)
 	static bool Toggle_MTP(bool enable);                                        // Disables MTP if enable is false and re-enables MTP if enable is true and it was enabled the last time it was toggled off
+	static std::string to_string(unsigned long value); //convert ul to string
 
 	static void SetPerformanceMode(bool mode); // support recovery.perf.mode