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Diffstat (limited to 'nixos/modules/services/hardware/undervolt.nix')
-rw-r--r--nixos/modules/services/hardware/undervolt.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/nixos/modules/services/hardware/undervolt.nix b/nixos/modules/services/hardware/undervolt.nix
index c49d944cdc18..944777475401 100644
--- a/nixos/modules/services/hardware/undervolt.nix
+++ b/nixos/modules/services/hardware/undervolt.nix
@@ -5,8 +5,8 @@ let
   cfg = config.services.undervolt;
 
   mkPLimit = limit: window:
-    if (isNull limit && isNull window) then null
-    else assert asserts.assertMsg (!isNull limit && !isNull window) "Both power limit and window must be set";
+    if (limit == null && window == null) then null
+    else assert asserts.assertMsg (limit != null && window != null) "Both power limit and window must be set";
       "${toString limit} ${toString window}";
   cliArgs = lib.cli.toGNUCommandLine {} {
     inherit (cfg)