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-rw-r--r--modules/by-name/st/stalwart-mail/module.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/modules/by-name/st/stalwart-mail/module.nix b/modules/by-name/st/stalwart-mail/module.nix
index eb2703c..031c35b 100644
--- a/modules/by-name/st/stalwart-mail/module.nix
+++ b/modules/by-name/st/stalwart-mail/module.nix
@@ -41,6 +41,7 @@ in {
     };
 
     principals = lib.mkOption {
+      default = [];
       type = lib.types.listOf (lib.types.submodule {
         options = {
           name = lib.mkOption {