diff --git a/pkgs/top-level/default.nix b/pkgs/top-level/default.nix
index 904ef8d39796d..dfa68ba31b841 100644
--- a/pkgs/top-level/default.nix
+++ b/pkgs/top-level/default.nix
@@ -38,6 +38,9 @@
   # environment. See below for the arguments given to that function, the type of
   # list it returns.
   stdenvStages ? import ../stdenv
+
+, # Ignore unexpected args.
+  ...
 } @ args:
 
 let # Rename the function arguments
diff --git a/pkgs/top-level/impure.nix b/pkgs/top-level/impure.nix
index 88440f711d363..3ba6c08a140b2 100644
--- a/pkgs/top-level/impure.nix
+++ b/pkgs/top-level/impure.nix
@@ -81,7 +81,7 @@ in
 # not be passed.
 assert args ? localSystem -> !(args ? system || args ? platform);
 
-import ./. (builtins.removeAttrs args [ "system" "platform" "inNixShell" ] // {
+import ./. (builtins.removeAttrs args [ "system" "platform" ] // {
   inherit config overlays crossSystem crossOverlays;
   # Fallback: Assume we are building packages on the current (build, in GNU
   # Autotools parlance) system.