diff --git a/nixos/modules/config/zram.nix b/nixos/modules/config/zram.nix
index c1958d3b47ba..44db5ce9d641 100644
--- a/nixos/modules/config/zram.nix
+++ b/nixos/modules/config/zram.nix
@@ -49,7 +49,7 @@ in
 
       memoryPercent = lib.mkOption {
         default = 50;
-        type = lib.types.int;
+        type = lib.types.ints.positive;
         description = ''
           Maximum total amount of memory that can be stored in the zram swap devices
           (as a percentage of your total memory). Defaults to 1/2 of your total