diff --git a/extra/docker/Dockerfile b/extra/docker/Dockerfile
index f2dec0b..78a11d2 100644
--- a/extra/docker/Dockerfile
+++ b/extra/docker/Dockerfile
@@ -1,7 +1,7 @@
 FROM ubuntu:16.04
 
 RUN apt-get update && apt-get install -y build-essential libphysfs-dev libboost-dev cmake libsdl2-dev libsdl2-image-dev \
-libsdl2-gfx-dev libsdl2-mixer-dev libsdl2-ttf-dev libboost-program-options-dev libutfcpp-dev zip gettext
+libsdl2-gfx-dev libsdl2-mixer-dev libsdl2-ttf-dev libboost-program-options-dev libutfcpp-dev libbox2d-dev zip gettext
 
 RUN mkdir -p /staging/saland