diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2d8d1cb..9141aac 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -16,7 +16,7 @@ sync:github:
     - apk add --no-cache openssh-client git
     # SSH deploy key
     - eval $(ssh-agent -s)
-    - ssh-add <(echo "$SSH_PRIVATE_KEY")
+    - ssh-add <(echo "${SSH_PRIVATE_KEY}")
     - mkdir -p ~/.ssh
     - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
   script: