diff --git a/src/tile_map.cpp b/src/tile_map.cpp
--- a/src/tile_map.cpp
+++ b/src/tile_map.cpp
@@ -11,7 +11,6 @@
 
 #include "stdafx.h"
 #include "tile_map.h"
-#include "core/math_func.hpp"
 
 /**
  * Return the slope of a given tile