diff --git a/pkgs/by-name/li/libtommath/package.nix b/pkgs/by-name/li/libtommath/package.nix
index cfc07912e46d..296617e1ee38 100644
--- a/pkgs/by-name/li/libtommath/package.nix
+++ b/pkgs/by-name/li/libtommath/package.nix
@@ -29,10 +29,6 @@ stdenv.mkDerivation rec {
 
   makefile = "makefile.shared";
 
-  env.NIX_CFLAGS_COMPILE = lib.optionalString (
-    stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64
-  ) "-DTARGET_OS_IPHONE=0";
-
   enableParallelBuilding = true;
 
   meta = with lib; {