diff --git a/docker/proton.Dockerfile.in b/docker/proton.Dockerfile.in
index afaa2539..7d98187e 100644
--- a/docker/proton.Dockerfile.in
+++ b/docker/proton.Dockerfile.in
@@ -61,6 +61,7 @@ RUN apt-get install -y \
   libcapstone-dev:i386 \
   libutfcpp-dev \
   yasm \
+  nasm \
 && rm -rf /opt/usr/share/doc /opt/usr/share/info /opt/usr/share/man \
 && rm -rf /var/lib/apt/lists/*