Cleanup extra-functions
diff --git a/data.hpp b/data.hpp
index c3fb52a..ecf4d70 100644
--- a/data.hpp
+++ b/data.hpp
@@ -47,6 +47,7 @@
     static int SetValue(const string varName, float value, int persist = 0);
 
     static void DumpValues();
+	static void update_tz_environment_variables();
 	static void SetDefaultValues();
 	static void ReadSettingsFile(void);