diff --git a/Dockerfile b/Dockerfile
index 87d8362..993f689 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 FROM postgres
 ARG GIT_COMMIT=""
-CMD echo 'echo "git commit = ${GIT_COMMIT}"' >> ./initdb.sh
+CMD echo 'echo "git commit = $GIT_COMMIT"' >> ./initdb.sh
 COPY ./initdb.sh /docker-entrypoint-initdb.d/initdb.sh
 EXPOSE 5432