diff --git a/newlib/libc/posix/ftw.c b/newlib/libc/posix/ftw.c
index 18cfc24cb..79e63582c 100644
--- a/newlib/libc/posix/ftw.c
+++ b/newlib/libc/posix/ftw.c
@@ -1,3 +1,5 @@
+#ifndef HAVE_OPENDIR
+
 /*
 * Copyright © 2005-2020 Rich Felker, et al.
 *
@@ -31,3 +33,4 @@ int ftw(const char *path, int (*fn)(const char *, const struct stat *, int), int
 	return nftw(path, (int (*)())fn, fd_limit, FTW_PHYS);
 }
 
+#endif /* ! HAVE_OPENDIR */
diff --git a/newlib/libc/posix/nftw.c b/newlib/libc/posix/nftw.c
index c45cc8f17..17c5bfd1e 100644
--- a/newlib/libc/posix/nftw.c
+++ b/newlib/libc/posix/nftw.c
@@ -1,3 +1,5 @@
+#ifndef HAVE_OPENDIR
+
 /*
 * Copyright © 2005-2020 Rich Felker, et al.
 *
@@ -154,3 +156,4 @@ int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, str
 	return r;
 }
 
+#endif /* ! HAVE_OPENDIR */