diff --git a/functions.h b/functions.h
--- a/functions.h
+++ b/functions.h
@@ -275,7 +275,6 @@ void CheckConfig(void);
 int ttd_main(int argc, char* argv[]);
 
 void DeterminePaths(void);
-char * CDECL str_fmt(const char *str, ...);
 
 void bubblesort(void *base, size_t nmemb, size_t size, int(*compar)(const void *, const void *));
 bool CreateOTTDThread(void *func, void *param);