diff --git a/src/map.cpp b/src/map.cpp
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -12,7 +12,6 @@
 #include "stdafx.h"
 #include "debug.h"
 #include "core/alloc_func.hpp"
-#include "core/math_func.hpp"
 #include "tile_map.h"
 
 #if defined(_MSC_VER)