diff --git a/docker/Dockerfile b/docker/Dockerfile
index 4dfac9ff..a0133a83 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -12,6 +12,7 @@ libjpeg-dev \
 python-crypto \
 python-openssl \
 libssl-dev \
+libffi-dev \
 software-properties-common
 
 RUN add-apt-repository ppa:mc3man/trusty-media \