diff --git a/libc/stdio/mktemp.c b/libc/stdio/mktemp.c
index 951f803..aaa5640 100644
--- a/libc/stdio/mktemp.c
+++ b/libc/stdio/mktemp.c
@@ -65,7 +65,7 @@
 
 char *_mktemp(char *);
 
-char *
+__LIBC_HIDDEN__ char *
 _mktemp(char *path)
 {
 	return(_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL);