diff --git a/nixos/modules/services/misc/pykms.nix b/nixos/modules/services/misc/pykms.nix
index 314388e0152e..be3accc0d7e5 100644
--- a/nixos/modules/services/misc/pykms.nix
+++ b/nixos/modules/services/misc/pykms.nix
@@ -85,7 +85,7 @@ in
         WorkingDirectory = libDir;
         SyslogIdentifier = "pykms";
         Restart = "on-failure";
-        MemoryLimit = cfg.memoryLimit;
+        MemoryMax = cfg.memoryLimit;
       };
     };
   };