From d03b0676660d764e85be98976e5522a6bfcc56e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Calder=C3=B3n?=
 <21376367+dantros@users.noreply.github.com>
Date: Sun, 22 Mar 2026 20:58:33 -0700
Subject: [PATCH] adding missing header guard (#483)

---
 include/pybind11/stl.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/pybind11/stl.h b/include/pybind11/stl.h
index cb29b1dc..e7a2d3e4 100644
--- a/include/pybind11/stl.h
+++ b/include/pybind11/stl.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include "pybind11.h"
 
 #include <array>