diff --git a/src/dir.c b/src/dir.c
index 1ea99eccf..e958ced8a 100644
--- a/src/dir.c
+++ b/src/dir.c
@@ -180,6 +180,28 @@ mrb_dir_chdir(mrb_state *mrb, mrb_value klass)
   return mrb_fixnum_value(0);
 }
 
+mrb_value
+mrb_dir_chroot(mrb_state *mrb, mrb_value self)
+{
+  #if defined(_WIN32) || defined(_WIN64) || defined(__android__)
+  mrb_raise(mrb, E_NOTIMP_ERROR, "chroot() unreliable on Win platforms");
+  return mrb_fixnum_value(0);
+  #else
+  mrb_value spath;
+  char *path;
+  int res;
+
+  mrb_get_args(mrb, "S", &spath);
+  path = mrb_str_to_cstr(mrb, spath);
+  res = chroot(path);
+  if (res == -1) {
+    mrb_sys_fail(mrb, path);
+  }
+
+  return mrb_fixnum_value(res);
+  #endif
+}
+
 mrb_value
 mrb_dir_read(mrb_state *mrb, mrb_value self)
 {
@@ -266,6 +288,7 @@ mrb_mruby_dir_gem_init(mrb_state *mrb)
   mrb_define_class_method(mrb, d, "getwd",  mrb_dir_getwd,  MRB_ARGS_NONE());
   mrb_define_class_method(mrb, d, "mkdir",  mrb_dir_mkdir,  MRB_ARGS_REQ(1)|MRB_ARGS_OPT(1));
   mrb_define_class_method(mrb, d, "_chdir", mrb_dir_chdir,  MRB_ARGS_REQ(1));
+  mrb_define_class_method(mrb, d, "chroot", mrb_dir_chroot, MRB_ARGS_REQ(1));
 
   mrb_define_method(mrb, d, "close",      mrb_dir_close,  MRB_ARGS_NONE());
   mrb_define_method(mrb, d, "initialize", mrb_dir_init,   MRB_ARGS_REQ(1));