diff --git a/src/game/vmap/BIH.h b/src/game/vmap/BIH.h
index 4e95e5e7..1fb0e8f9 100644
--- a/src/game/vmap/BIH.h
+++ b/src/game/vmap/BIH.h
@@ -28,6 +28,7 @@
 #include <stdexcept>
 #include <vector>
 #include <algorithm>
+#include <cmath>
 
 #include <Platform/Define.h>