diff --git a/Dockerfile b/Dockerfile
index 1e70001..f8e4c94 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM jedisct1/alpine-runit:latest
 MAINTAINER Frank Denis
 ENV SERIAL 1
 
-ENV BUILD_DEPS   make gcc musl-dev git libevent-dev expat-dev shadow autoconf file openssl-dev
+ENV BUILD_DEPS   make gcc musl-dev git libevent-dev expat-dev shadow autoconf file openssl-dev byacc
 ENV RUNTIME_DEPS bash util-linux coreutils findutils grep openssl ldns ldns-tools libevent expat libexecinfo coreutils drill ca-certificates
 
 RUN set -x && \