diff --git a/include/nlohmann/thirdparty/hedley/hedley_undef.hpp b/include/nlohmann/thirdparty/hedley/hedley_undef.hpp
index e74f4dfbf..d2b37a16d 100644
--- a/include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+++ b/include/nlohmann/thirdparty/hedley/hedley_undef.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 #undef JSON_HEDLEY_ALWAYS_INLINE
 #undef JSON_HEDLEY_ARM_VERSION
 #undef JSON_HEDLEY_ARM_VERSION_CHECK
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index d41609174..20a58ba45 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -25543,6 +25543,8 @@ inline nlohmann::json::json_pointer operator "" _json_pointer(const char* s, std
 #undef JSON_EXPLICIT
 
 // #include <nlohmann/thirdparty/hedley/hedley_undef.hpp>
+
+
 #undef JSON_HEDLEY_ALWAYS_INLINE
 #undef JSON_HEDLEY_ARM_VERSION
 #undef JSON_HEDLEY_ARM_VERSION_CHECK