diff --git a/flake.nix b/flake.nix
index 3b8fda0..039e989 100644
--- a/flake.nix
+++ b/flake.nix
@@ -193,7 +193,7 @@
                     ${
                       if cfg.phx.database.passwordFile != null
                       then ''
-                        DB_PASSWORD=$(cat ${cfg.phx.database.passwordFile})
+                        export DB_PASSWORD=$(cat ${cfg.phx.database.passwordFile})
                         export DATABASE_URL="postgresql://${cfg.phx.database.user}:$DB_PASSWORD@${cfg.phx.database.host}/${cfg.phx.database.name}"
                       ''
                       else ''