diff --git a/Dockerfile b/Dockerfile
index fb3e22f..c2ba159 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -89,8 +89,10 @@ apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
 run \
 update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-9 100; \
 update-alternatives --install /usr/bin/clang clang /usr/bin/clang-9 100; \
+update-alternatives --install /usr/bin/clang-format clang-format /usr/bin/clang-format-9 100; \
 update-alternatives --config clang; \
-update-alternatives --config clang++
+update-alternatives --config clang++; \
+update-alternatives --config clang-format 
 
 # this is done here so that ccache sees clang++ installed, not clang-9
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y ccache