diff --git a/docker/proton.Dockerfile.in b/docker/proton.Dockerfile.in
index 9daee665..d3845d26 100644
--- a/docker/proton.Dockerfile.in
+++ b/docker/proton.Dockerfile.in
@@ -55,6 +55,8 @@ RUN apt-get install -y \
   libxpresent-dev \
   libxpresent-dev:i386 \
   python3-pefile \
+  libcapstone-dev \
+  libcapstone-dev:i386 \
 && rm -rf /opt/usr/share/doc /opt/usr/share/info /opt/usr/share/man \
 && rm -rf /var/lib/apt/lists/*