src/os/root_openat.go | 4 ++--

diff --git a/src/os/root_openat.go b/src/os/root_openat.go
index 1875877dd23dd47c688da18dda5b50f7f9c1615f..62e6be665a9233ebf679145d0e0dfe277222491b 100644
--- a/src/os/root_openat.go
+++ b/src/os/root_openat.go
@@ -109,7 +109,7 @@
 func rootMkdir(r *Root, name string, perm FileMode) error {
 	flags := uint(doInRootCreatingDirectory)
 	switch runtime.GOOS {
-	case "linux", "windows":
+	case "linux", "windows", "openbsd":
 		// These platforms do not follow "symlink" on "mkdir symlink/".
 		// (POSIX.1-2024 4.16 says that the trailing slash should cause
 		// resolution to follow the symlink, but we're trying to match
@@ -185,7 +185,7 @@ 		return struct{}{}, &PathError{Op: "mkdirat", Err: err}
 	}
 	flags := uint(doInRootCreatingDirectory)
 	switch runtime.GOOS {
-	case "linux", "windows":
+	case "linux", "windows", "openbsd":
 		flags |= doInRootNoHandleTerminalSlash // see rootMkdir
 	}
 	_, err := doInRoot(r, fullname, flags, openDirFunc, openLastComponentFunc)