diff --git a/src/opticalattackdetector/.gitlab-ci.yml b/src/opticalattackdetector/.gitlab-ci.yml
index 5aa39f3a2069cd5b10b3a490840ae283033afd71..b04c34d1907fd61fd1fcc7dbce65fb3cd3c4c6b8 100644
--- a/src/opticalattackdetector/.gitlab-ci.yml
+++ b/src/opticalattackdetector/.gitlab-ci.yml
@@ -52,9 +52,9 @@ unit_test opticalattackdetector:
     - if docker container ls | grep redis; then docker rm -f redis; else echo "redis image is not in the system"; fi
     - if docker container ls | grep dbscanserving; then docker rm -f dbscanserving; else echo "dbscanserving image is not in the system"; fi
   script:
-    - export REDIS_PASSWORD=`uuidgen`
+    - export REDIS_PASSWORD=$(uuidgen)
     - docker pull "redis:7.0-alpine"
-    - docker run --name redis -d --network=teraflowbridge -p 6379:6379 -e REDIS_PASSWORD=${REDIS_PASSWORD} --rm redis:7.0-alpine "redis-server --requirepass $(REDIS_PASSWORD)"
+    - docker run --name redis -d --network=teraflowbridge -p 6379:6379 -e REDIS_PASSWORD=$(REDIS_PASSWORD) --rm redis:7.0-alpine "redis-server --requirepass $(REDIS_PASSWORD)"
     - REDIS_ADDRESS=$(docker inspect redis --format "{{.NetworkSettings.Networks.teraflowbridge.IPAddress}}")
     - docker pull "$CI_REGISTRY_IMAGE/dbscanserving:$IMAGE_TAG"
     - docker run --name dbscanserving -d -p 10008:10008 --network=teraflowbridge --rm $CI_REGISTRY_IMAGE/dbscanserving:$IMAGE_TAG