diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4125858..8cb13c0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,7 +5,7 @@ build:signal-server:
   stage: build
   script:
     - docker login -u gitlab-ci-token -p ${CI_JOB_TOKEN} ${CI_REGISTRY}
-    - docker build -t ${CI_REGISTRY_IMAGE}/signal-server:${CI_COMMIT_SHA:0:8} .
+    - docker build -f signal-server.Dockerfile -t ${CI_REGISTRY_IMAGE}/signal-server:${CI_COMMIT_SHA:0:8} .
     - export VERSION=$(docker run ${CI_REGISTRY_IMAGE}/signal-server:${CI_COMMIT_SHA:0:8} -v)
     - docker tag ${CI_REGISTRY_IMAGE}/signal-server:${CI_COMMIT_SHA:0:8} ${CI_REGISTRY_IMAGE}/signal-server:${CI_COMMIT_REF_SLUG}
     - docker tag ${CI_REGISTRY_IMAGE}/signal-server:${CI_COMMIT_SHA:0:8} ${CI_REGISTRY_IMAGE}/signal-server:${VERSION}