diff --git a/extra/docker/Dockerfile.WindowsBuild b/extra/docker/Dockerfile.WindowsBuild
index 51c741f..3bd6b01 100644
--- a/extra/docker/Dockerfile.WindowsBuild
+++ b/extra/docker/Dockerfile.WindowsBuild
@@ -1,11 +1,14 @@
 FROM sago007/docker_blockattack
 
-RUN apt-get update && apt-get install -y zip gettext mxe-i686-w64-mingw32.static-sdl2-gfx mxe-i686-w64-mingw32.static-libxml2 mxe-i686-w64-mingw32.static-box2d
+RUN apt-get update && apt-get install -y zip gettext mxe-i686-w64-mingw32.static-sdl2-gfx mxe-i686-w64-mingw32.static-libxml2 mxe-i686-w64-mingw32.static-box2d libutfcpp-dev
 
 RUN mkdir -p /staging/saland
 
 COPY . /staging/saland
 
+RUN cp -r /usr/include/utf8 /staging/saland/src/Libs/include/ && \
+cp /usr/include/utf8.h /staging/saland/src/Libs/include/
+
 RUN cd /staging/saland && \
 i686-w64-mingw32.static-cmake . && \
 make
diff --git a/src/saland/GameDraw.cpp b/src/saland/GameDraw.cpp
index 483c4d2..d9aef9d 100644
--- a/src/saland/GameDraw.cpp
+++ b/src/saland/GameDraw.cpp
@@ -23,6 +23,7 @@ https://github.com/sago007/saland
 
 #include "GameDraw.hpp"
 #include <SDL2/SDL2_gfxPrimitives.h>
+#include <cmath>
 
 static void Draw(SDL_Renderer* target, SDL_Texture* t, int x, int y, const SDL_Rect& part) {
 	SDL_Rect pos = {};