diff --git a/nixos/modules/security/acme/default.nix b/nixos/modules/security/acme/default.nix
index 66d1d2c5d9c5..ea94b54312cf 100644
--- a/nixos/modules/security/acme/default.nix
+++ b/nixos/modules/security/acme/default.nix
@@ -487,7 +487,7 @@ let
       };
 
       email = mkOption {
-        type = types.str;
+        type = types.nullOr types.str;
         inherit (defaultAndText "email" null) default defaultText;
         description = lib.mdDoc ''
           Email address for account creation and correspondence from the CA.
@@ -555,7 +555,7 @@ let
       };
 
       credentialsFile = mkOption {
-        type = types.path;
+        type = types.nullOr types.path;
         inherit (defaultAndText "credentialsFile" null) default defaultText;
         description = lib.mdDoc ''
           Path to an EnvironmentFile for the cert's service containing any required and