diff --git a/include/astar/astar.hpp b/include/astar/astar.hpp
index 39d2e13..b4ba127 100644
--- a/include/astar/astar.hpp
+++ b/include/astar/astar.hpp
@@ -3,7 +3,8 @@
  * MIT License
  */
 
-#pragma once
+#ifndef BEN_ASTAR_HPP
+#define BEN_ASTAR_HPP
 
 #include <algorithm>
 #include <cmath>
@@ -363,3 +364,5 @@ class AStarFast final : public AStarVirtual<CoordinateType, enableDebug> {
 };
 
 }  // namespace AStar
+
+#endif