diff --git a/modules/hardware/network/b43.nix b/modules/hardware/network/b43.nix
index caf40f68058e..8f45bd4d3f1a 100644
--- a/modules/hardware/network/b43.nix
+++ b/modules/hardware/network/b43.nix
@@ -23,7 +23,7 @@ let kernelVersion = config.boot.kernelPackages.kernel.version; in
 
   config = pkgs.lib.mkIf config.networking.enableB43Firmware {
     assertions = [ {
-      assertion = builtins.lessThan (builtins.compareVersions kernelVersion "3.2") 0;
+      assertion = builtins.lessThan 0 (builtins.compareVersions kernelVersion "3.2");
       message = "b43 firmware for kernels older than 3.2 not packaged yet!";
     } ];
     hardware.firmware = [ pkgs.b43Firmware_5_1_138 ];