diff --git a/src/bitmap_type.h b/src/bitmap_type.h
index 2e07fdf8a5..4119248299 100644
--- a/src/bitmap_type.h
+++ b/src/bitmap_type.h
@@ -10,6 +10,7 @@
 #ifndef BITMAP_TYPE_HPP
 #define BITMAP_TYPE_HPP
 
+#include "tilearea_type.h"
 #include <vector>
 
 /** Represents a tile area containing containing individually set tiles.