diff --git a/docker/proton.Dockerfile.in b/docker/proton.Dockerfile.in
index d3845d26..77f0fd33 100644
--- a/docker/proton.Dockerfile.in
+++ b/docker/proton.Dockerfile.in
@@ -57,6 +57,7 @@ RUN apt-get install -y \
   python3-pefile \
   libcapstone-dev \
   libcapstone-dev:i386 \
+  yasm \
 && rm -rf /opt/usr/share/doc /opt/usr/share/info /opt/usr/share/man \
 && rm -rf /var/lib/apt/lists/*