diff --git a/includes/animations.h b/includes/animations.h
index ffa96b0..958dc9b 100644
--- a/includes/animations.h
+++ b/includes/animations.h
@@ -1,5 +1,5 @@
-#ifndef DEMO_ANIMATION_HPP
-#define DEMO_ANIMATION_HPP 1
+#ifndef DEMO_ANIMATION_H
+#define DEMO_ANIMATION_H 1
 
 #include <GL4D/gl4duw_SDL2.h>
 
diff --git a/includes/audio.h b/includes/audio.h
index 60b8572..8bb5a23 100644
--- a/includes/audio.h
+++ b/includes/audio.h
@@ -1,5 +1,5 @@
-#ifndef DEMO_AUDIO_HPP
-#define DEMO_AUDIO_HPP 1
+#ifndef DEMO_AUDIO_H
+#define DEMO_AUDIO_H 1
 
 #include <SDL_mixer.h>
 
diff --git a/includes/font.h b/includes/font.h
index 6be97c0..6b5160b 100644
--- a/includes/font.h
+++ b/includes/font.h
@@ -1,5 +1,5 @@
-#ifndef DEMO_FONT_HPP
-#define DEMO_FONT_HPP 1
+#ifndef DEMO_FONT_H
+#define DEMO_FONT_H 1
 
 #include <GL4D/gl4dh.h>
 #include <SDL_ttf.h>