diff --git a/src/tmxlayer.hpp b/src/tmxlayer.hpp
index e25484a..34caf34 100644
--- a/src/tmxlayer.hpp
+++ b/src/tmxlayer.hpp
@@ -1,7 +1,7 @@
 /* tmxlayer.hpp - Copyright (C) 2015-2022 a dinosaur (zlib, see COPYING.txt) */
 
-#ifndef TMXLAYER_H
-#define TMXLAYER_H
+#ifndef TMXLAYER_HPP
+#define TMXLAYER_HPP
 
 #include <string>
 #include <cstdint>
@@ -31,4 +31,4 @@ private:
 	uint32_t* mTileDat;
 };
 
-#endif//TMXLAYER_H
+#endif//TMXLAYER_HPP
diff --git a/src/tmxobject.hpp b/src/tmxobject.hpp
index 5b1e841..85b5b41 100644
--- a/src/tmxobject.hpp
+++ b/src/tmxobject.hpp
@@ -1,7 +1,7 @@
-/* tmxobject.cpp - Copyright (C) 2015-2022 a dinosaur (zlib, see COPYING.txt) */
+/* tmxobject.hpp - Copyright (C) 2015-2022 a dinosaur (zlib, see COPYING.txt) */
 
-#ifndef TMXOBJECT_H
-#define TMXOBJECT_H
+#ifndef TMXOBJECT_HPP
+#define TMXOBJECT_HPP
 
 #include <string>
 #include <utility>
@@ -22,4 +22,4 @@ private:
 	float mX, mY;
 };
 
-#endif//TMXOBJECT_H
+#endif//TMXOBJECT_HPP
diff --git a/src/tmxreader.hpp b/src/tmxreader.hpp
index b7be596..0490569 100644
--- a/src/tmxreader.hpp
+++ b/src/tmxreader.hpp
@@ -1,7 +1,7 @@
 /* tmxreader.hpp - Copyright (C) 2015-2022 a dinosaur (zlib, see COPYING.txt) */
 
-#ifndef TMXREADER_H
-#define TMXREADER_H
+#ifndef TMXREADER_HPP
+#define TMXREADER_HPP
 
 #include <istream>
 #include <vector>
@@ -47,4 +47,4 @@ private:
 
 };
 
-#endif//TMXREADER_H
+#endif//TMXREADER_HPP
diff --git a/src/tmxtileset.hpp b/src/tmxtileset.hpp
index a79eb27..4dbeb6c 100644
--- a/src/tmxtileset.hpp
+++ b/src/tmxtileset.hpp
@@ -1,7 +1,7 @@
 /* tmxtileset.hpp - Copyright (C) 2015-2022 a dinosaur (zlib, see COPYING.txt) */
 
-#ifndef TMXTILESET_H
-#define TMXTILESET_H
+#ifndef TMXTILESET_HPP
+#define TMXTILESET_HPP
 
 #include <string>
 #include <cstdint>
@@ -26,4 +26,4 @@ private:
 
 };
 
-#endif//TMXTILESET_H
+#endif//TMXTILESET_HPP