diff --git a/config/runtime.exs b/config/runtime.exs
index 1268e41..56fcf19 100644
--- a/config/runtime.exs
+++ b/config/runtime.exs
@@ -34,6 +34,7 @@ if config_env() == :prod do
     # ssl: true,
     url: database_url,
     pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10"),
+    socket_dir: System.get_env("DATABASE_SOCKET_DIR"),
     socket_options: maybe_ipv6
 
   # The secret key base is used to sign/encrypt cookies and other secrets.