-extern int ust_safe_fflush(LFILE *fp);
-extern int ust_safe_vfprintf(LFILE *fp, const char *fmt0, va_list ap);
+__attribute__((visibility("hidden")))
+extern int ust_safe_fflush(LTTNG_UST_LFILE *fp);
+
+__attribute__((visibility("hidden")))
+extern int ust_safe_vfprintf(LTTNG_UST_LFILE *fp, const char *fmt0, va_list ap);
+
+__attribute__((visibility("hidden")))
+extern size_t ust_safe_mbrtowc(wchar_t *pwc, const char *s, size_t n, mbstate_t *ps);