diff --git a/docker/Dockerfile.build b/docker/Dockerfile.build
index 9b99a23d..336bd8af 100644
--- a/docker/Dockerfile.build
+++ b/docker/Dockerfile.build
@@ -3,7 +3,7 @@ FROM rust:buster as builder
 
 RUN apt-get update && \
 	apt-get install -y --no-install-recommends \
-	make cmake g++ gcc llvm libclang-dev
+	make cmake g++ gcc llvm libclang-dev clang
 
 RUN mkdir /zebra
 WORKDIR /zebra
diff --git a/docker/Dockerfile.test b/docker/Dockerfile.test
index d501fe01..78d83048 100644
--- a/docker/Dockerfile.test
+++ b/docker/Dockerfile.test
@@ -2,7 +2,7 @@ FROM rustlang/rust:nightly
 
 RUN apt-get update && \
 	apt-get install -y --no-install-recommends \
-	make cmake g++ gcc llvm libclang-dev
+	make cmake g++ gcc llvm libclang-dev clang
 
 RUN mkdir /zebra
 WORKDIR /zebra