diff --git a/pmc/main.cc b/pmc/main.cc
--- a/pmc/main.cc
+++ b/pmc/main.cc
@@ -3,9 +3,9 @@
  * Copyright (C) 2008 Markus Broeker
  */
 
-#include <surface.h>
-#include <rectangle.h>
-#include <cube.h>
+#include <surface.hpp>
+#include <rectangle.hpp>
+#include <cube.hpp>
 
 #include <cstdio>
 #include <cstdlib>