diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index 7eb35df12..76ef5728a 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -4,12 +4,13 @@ FROM debian:12.5
 RUN apt-get -y update
 
 RUN apt-get -y install haskell-stack git
-RUN apt-get -y install libghc-zlib-dev libpq-dev
+RUN apt-get -y install alex g++ happy libghc-zlib-dev libpq-dev
 
 WORKDIR /fradrive
 
 ENV HOME=/fradrive
 # ENV STACK_ROOT=/fradrive/.stack
+ENV LANG=en_US.UTF-8
 
 ENV FRADRIVE_MAKE_TARGET=backend-build
 ENTRYPOINT make -- ${FRADRIVE_MAKE_TARGET}
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