diff --git a/nixos/modules/services/monitoring/grafana.nix b/nixos/modules/services/monitoring/grafana.nix
index 3e801f9b838..c30647f5460 100644
--- a/nixos/modules/services/monitoring/grafana.nix
+++ b/nixos/modules/services/monitoring/grafana.nix
@@ -235,7 +235,7 @@ in {
         but without GF_ prefix
       '';
       default = {};
-      type = types.attrsOf types.str;
+      type = with types; attrsOf (either str path);
     };
   };