diff --git a/src/modules/systemlib/err.h b/src/modules/systemlib/err.h
index b47a041daa..506cfb9742 100644
--- a/src/modules/systemlib/err.h
+++ b/src/modules/systemlib/err.h
@@ -94,22 +94,6 @@ __BEGIN_DECLS
 #define warn(...) 		PX4_WARN(__VA_ARGS__)
 #define warnx(...) 		PX4_WARN(__VA_ARGS__)
 
-// XXX not used anymore
-#if 0
-__EXPORT void	err(int eval, const char *fmt, ...)		__attribute__((noreturn, format(printf, 2, 3)));
-__EXPORT void	verr(int eval, const char *fmt, va_list)	__attribute__((noreturn, format(printf, 2, 0)));
-__EXPORT void	errc(int eval, int code, const char *fmt, ...)	__attribute__((noreturn, format(printf, 3, 4)));
-__EXPORT void	verrc(int eval, int code, const char *fmt, va_list) __attribute__((noreturn, format(printf, 3, 0)));
-__EXPORT void	errx(int eval, const char *fmt, ...) 		__attribute__((noreturn, format(printf, 2, 3)));
-__EXPORT void	verrx(int eval, const char *fmt, va_list)	__attribute__((noreturn, format(printf, 2, 0)));
-__EXPORT void	warn(const char *fmt, ...)			__attribute__((format(printf, 1, 2)));
-__EXPORT void	vwarn(const char *fmt, va_list)			__attribute__((format(printf, 1, 0)));
-__EXPORT void	warnc(int code, const char *fmt, ...)		__attribute__((format(printf, 2, 3)));
-__EXPORT void	vwarnc(int code, const char *fmt, va_list)	__attribute__((format(printf, 2, 0)));
-__EXPORT void	warnx(const char *fmt, ...)			__attribute__((format(printf, 1, 2)));
-__EXPORT void	vwarnx(const char *fmt, va_list)		__attribute__((format(printf, 1, 0)));
-#endif
-
 __END_DECLS
 
 #endif