diff --git a/nixos/modules/services/search/elasticsearch-curator.nix b/nixos/modules/services/search/elasticsearch-curator.nix
index 9620c3e0b6d4..bb2612322bba 100644
--- a/nixos/modules/services/search/elasticsearch-curator.nix
+++ b/nixos/modules/services/search/elasticsearch-curator.nix
@@ -55,6 +55,7 @@ in {
     };
     actionYAML = mkOption {
       description = "curator action.yaml file contents, alternatively use curator-cli which takes a simple action command";
+      type = types.lines;
       example = ''
         ---
         actions: