diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index 2fad3d695..9741a6a87 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -31,7 +31,7 @@ WORKDIR ${PROJECT_DIR}
 ENV HOME=${PROJECT_DIR}
 ENV STACK_ROOT="${PROJECT_DIR}/.stack"
 
-RUN [ if ! -z "${IN_CI}" ]; then \
+RUN if [ ! -z "${IN_CI}" ]; then \
   stack install yesod-bin; \
   stack install hpack; \
 fi
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