diff --git a/Dockerfile b/Dockerfile
index feb0d8bf8..cc13f4944 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ WORKDIR /elks
 RUN apt-get update -qq \
  && apt-get install -y --no-install-recommends \
   flex bison texinfo libncurses5-dev \
-  bash make g++ git libelf-dev \
+  bash make g++ git libelf-dev patch \
   xxd ca-certificates wget mtools \
  && rm -r /var/lib/apt/lists /var/cache/apt/archives \
  && addgroup \