1 files changed, 2 insertions, 0 deletions

diff --git a/docker/Dockerfile-dhvirtualenv b/docker/Dockerfile-dhvirtualenv

index b7679924c2..f000144567 100644
--- a/docker/Dockerfile-dhvirtualenv
+++ b/docker/Dockerfile-dhvirtualenv
@@ -73,6 +73,8 @@ RUN apt-get update -qq -o Acquire::Languages=none \
     curl \
     debhelper \
     devscripts \
+    # Required for building cffi from source.
+    libffi-dev \
     libsystemd-dev \
     lsb-release \
     pkg-config \