diff --git a/pkgs/tools/video/atomicparsley/default.nix b/pkgs/tools/video/atomicparsley/default.nix
index 835cacf0098c..b2eb53666181 100644
--- a/pkgs/tools/video/atomicparsley/default.nix
+++ b/pkgs/tools/video/atomicparsley/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, pkgs, fetchurl }:
+{ stdenv, fetchurl, unzip, darwin }:
 
 stdenv.mkDerivation rec {
   name = "atomicparsley-${version}";
@@ -10,10 +10,13 @@ stdenv.mkDerivation rec {
     sha256 = "de83f219f95e6fe59099b277e3ced86f0430ad9468e845783092821dff15a72e";
   };
 
-  buildInputs = with pkgs; [ unzip ]
-    ++ stdenv.lib.optionals stdenv.isDarwin [ darwin.apple_sdk.frameworks.Cocoa ];
-  patches = [ ./casts.patch ];
+  patches = stdenv.lib.optional (!stdenv.cc.isClang) ./casts.patch;
+
+  buildInputs = [ unzip ]
+    ++ stdenv.lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.Cocoa;
+
   setSourceRoot = "sourceRoot=${product}-source-${version}";
+
   buildPhase = "bash build";
   installPhase = "install -D AtomicParsley $out/bin/AtomicParsley";