diff --git a/docker/proton.Dockerfile.in b/docker/proton.Dockerfile.in
index 0a71e4fe..95f06782 100644
--- a/docker/proton.Dockerfile.in
+++ b/docker/proton.Dockerfile.in
@@ -52,6 +52,7 @@ RUN bash -c 'mkdir -p /usr/lib/ccache && ls /usr/bin/{,*-}{cc,c++,gcc,g++}{,-[0-
 ENV PATH=/usr/lib/ccache:$PATH
 
 RUN apt-get install -y \
+  autoconf-archive \
   fontforge \
   fonttools \
   libxpresent-dev \