diff --git a/ci/Dockerfile b/ci/Dockerfile
index 20d453a8c..4f3dd0754 100644
--- a/ci/Dockerfile
+++ b/ci/Dockerfile
@@ -9,7 +9,8 @@ ENV TOOLCHAIN_FLAVOR=$TOOLCHAIN_FLAVOR
 
 RUN apt-get update && apt-get install -y \
     build-essential wget git libsodium-dev graphviz \
-    valgrind check libssl-dev libusb-1.0-0-dev libudev-dev zlib1g-dev
+    valgrind check libssl-dev libusb-1.0-0-dev libudev-dev zlib1g-dev \
+    clang-format
 
 # TODO are all apt packages actually needed?