diff --git a/pkgs/tools/graphics/icoutils/default.nix b/pkgs/tools/graphics/icoutils/default.nix
index 62b4ab6b303e..07f605a4cbff 100644
--- a/pkgs/tools/graphics/icoutils/default.nix
+++ b/pkgs/tools/graphics/icoutils/default.nix
@@ -13,6 +13,10 @@ stdenv.mkDerivation rec {
   buildInputs = [ libpng perl ];
   propagatedBuildInputs = [ perlPackages.LWP ];
 
+  # Fixes a build failure on aarch64-darwin. Define for all Darwin targets for when x86_64-darwin
+  # upgrades to a newer SDK.
+  NIX_CFLAGS_COMPILE = lib.optional stdenv.isDarwin "-DTARGET_OS_IPHONE=0";
+
   patchPhase = ''
     patchShebangs extresso/extresso
     patchShebangs extresso/extresso.in