diff --git a/doc/ci/docker/using_docker_images.md b/doc/ci/docker/using_docker_images.md
index 191e3a8144d..ef8a7ec1e86 100644
--- a/doc/ci/docker/using_docker_images.md
+++ b/doc/ci/docker/using_docker_images.md
@@ -90,7 +90,7 @@ you need to set MYSQL_ALLOW_EMPTY_PASSWORD.
     - mysql
     
     variables:
-      MYSQL_ALLOW_EMPTY_PASSWORD: yes
+      MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
     ```
 
 For other possible configuration variables check the