diff --git a/test/fileutils/test_fileutils.rb b/test/fileutils/test_fileutils.rb
index df07978b08..214f977ce5 100644
--- a/test/fileutils/test_fileutils.rb
+++ b/test/fileutils/test_fileutils.rb
@@ -913,7 +913,8 @@ class TestFileUtils
     # FreeBSD ufs and tmpfs don't allow to change sticky bit against
     # regular file. It's slightly strange. Anyway it's no effect bit.
     # see /usr/src/sys/ufs/ufs/ufs_chmod()
-    if /freebsd/ !~ RUBY_PLATFORM
+    # NetBSD also denies it.
+    if /freebsd|netbsd/ !~ RUBY_PLATFORM
       chmod "u+t,o+t", 'tmp/a'
       assert_equal 07500, File.stat('tmp/a').mode & 07777
       chmod "a-t,a-s", 'tmp/a'