diff --git a/config/docker.exs b/config/docker.exs
index 72b4e3121..ec5ffb993 100644
--- a/config/docker.exs
+++ b/config/docker.exs
@@ -39,7 +39,7 @@ config :mobilizon, Mobilizon.Storage.Repo,
   password: System.get_env("MOBILIZON_DATABASE_PASSWORD", "password"),
   database: System.get_env("MOBILIZON_DATABASE_DBNAME", "mobilizon"),
   hostname: System.get_env("MOBILIZON_DATABASE_HOST", "postgres"),
-  port: System.get_env("MOBILIZON_DATABASE_PORT", 5432),
+  port: System.get_env("MOBILIZON_DATABASE_PORT", "5432"),
   pool_size: 10
 
 config :mobilizon, Mobilizon.Web.Email.Mailer,