diff --git a/pkgs/development/libraries/webkitgtk/default.nix b/pkgs/development/libraries/webkitgtk/default.nix
index e925b6891027..cfff2e7f853d 100644
--- a/pkgs/development/libraries/webkitgtk/default.nix
+++ b/pkgs/development/libraries/webkitgtk/default.nix
@@ -223,11 +223,6 @@ stdenv.mkDerivation (finalAttrs: {
 
   postPatch = ''
     patchShebangs .
-  '' + lib.optionalString stdenv.isDarwin ''
-    # It needs malloc_good_size.
-    sed 22i'#include <malloc/malloc.h>' -i Source/WTF/wtf/FastMalloc.h
-    # <CommonCrypto/CommonRandom.h> needs CCCryptorStatus.
-    sed 43i'#include <CommonCrypto/CommonCryptor.h>' -i Source/WTF/wtf/RandomDevice.cpp
   '';
 
   postFixup = ''