diff --git a/nixos/modules/virtualisation/amazon-options.nix b/nixos/modules/virtualisation/amazon-options.nix
index 926fe43b0ffe..3ea4a6cf7818 100644
--- a/nixos/modules/virtualisation/amazon-options.nix
+++ b/nixos/modules/virtualisation/amazon-options.nix
@@ -28,13 +28,13 @@ in {
             options = {
               mount = lib.mkOption {
                 description = lib.mdDoc "Where to mount this dataset.";
-                type = types.nullOr types.string;
+                type = types.nullOr types.str;
                 default = null;
               };
 
               properties = lib.mkOption {
                 description = lib.mdDoc "Properties to set on this dataset.";
-                type = types.attrsOf types.string;
+                type = types.attrsOf types.str;
                 default = {};
               };
             };
diff --git a/nixos/modules/virtualisation/openstack-options.nix b/nixos/modules/virtualisation/openstack-options.nix
index c71b581b02ca..52f45de92ecb 100644
--- a/nixos/modules/virtualisation/openstack-options.nix
+++ b/nixos/modules/virtualisation/openstack-options.nix
@@ -29,13 +29,13 @@ in
             options = {
               mount = lib.mkOption {
                 description = lib.mdDoc "Where to mount this dataset.";
-                type = types.nullOr types.string;
+                type = types.nullOr types.str;
                 default = null;
               };
 
               properties = lib.mkOption {
                 description = lib.mdDoc "Properties to set on this dataset.";
-                type = types.attrsOf types.string;
+                type = types.attrsOf types.str;
                 default = { };
               };
             };