diff --git a/pkgs/os-specific/linux/kernel/generic.nix b/pkgs/os-specific/linux/kernel/generic.nix
index 6c8ae502731e..9248bea73126 100644
--- a/pkgs/os-specific/linux/kernel/generic.nix
+++ b/pkgs/os-specific/linux/kernel/generic.nix
@@ -91,8 +91,6 @@ let
     # cgit) that are needed here should be included directly in Nixpkgs as
     # files.
 
-    assert stdenv.hostPlatform.isLinux;
-
     let
       # Dirty hack to make sure that `version` & `src` have
       # `<nixpkgs/pkgs/os-specific/linux/kernel/linux-x.y.nix>` as position
diff --git a/pkgs/os-specific/linux/ply/default.nix b/pkgs/os-specific/linux/ply/default.nix
index 3e1dfa296706..53d3553afc0a 100644
--- a/pkgs/os-specific/linux/ply/default.nix
+++ b/pkgs/os-specific/linux/ply/default.nix
@@ -55,5 +55,6 @@ stdenv.mkDerivation rec {
       mic92
       mbbx6spp
     ];
+    platforms = lib.platforms.linux;
   };
 }
diff --git a/pkgs/test/nixos-functions/default.nix b/pkgs/test/nixos-functions/default.nix
index dc8e0b3ead31..4cc738cfaebe 100644
--- a/pkgs/test/nixos-functions/default.nix
+++ b/pkgs/test/nixos-functions/default.nix
@@ -21,14 +21,14 @@ let
     label = "test";
   };
 in
-pkgs.recurseIntoAttrs {
-
-  nixos-test =
-    (pkgs.nixos {
-      system.nixos = dummyVersioning;
-      boot.loader.grub.enable = false;
-      fileSystems."/".device = "/dev/null";
-      system.stateVersion = lib.trivial.release;
-    }).toplevel;
-
-}
+lib.optionalAttrs (stdenv.hostPlatform.isLinux) (
+  pkgs.recurseIntoAttrs {
+    nixos-test =
+      (pkgs.nixos {
+        system.nixos = dummyVersioning;
+        boot.loader.grub.enable = false;
+        fileSystems."/".device = "/dev/null";
+        system.stateVersion = lib.trivial.release;
+      }).toplevel;
+  }
+)