diff --git a/arch-builder/Dockerfile b/arch-builder/Dockerfile
index aac6311..0d5c261 100644
--- a/arch-builder/Dockerfile
+++ b/arch-builder/Dockerfile
@@ -96,6 +96,7 @@ RUN --mount=type=cache,target=/var/cache/pacman pacman -S --noconfirm --needed \
 USER luser
 WORKDIR /home/luser
 RUN rustup toolchain install stable-x86_64-unknown-linux-gnu --profile minimal
+RUN rustup component add rustfmt
 RUN rustup target add \
     x86_64-unknown-linux-musl \
     x86_64-unknown-linux-gnu \