diff --git a/pkgs/stdenv/cross/default.nix b/pkgs/stdenv/cross/default.nix
index b194c780a319..f2adc91e2bb1 100644
--- a/pkgs/stdenv/cross/default.nix
+++ b/pkgs/stdenv/cross/default.nix
@@ -4,7 +4,7 @@
   crossSystem,
   config,
   overlays,
-  crossOverlays ? [ ],
+  crossOverlays,
 }:
 
 let
diff --git a/pkgs/stdenv/default.nix b/pkgs/stdenv/default.nix
index 3e8a062ac6c0..9e573477f290 100644
--- a/pkgs/stdenv/default.nix
+++ b/pkgs/stdenv/default.nix
@@ -12,7 +12,7 @@
   crossSystem,
   config,
   overlays,
-  crossOverlays ? [ ],
+  crossOverlays,
 }:
 
 let