diff --git a/pkgs/os-specific/darwin/apple-source-releases/libpthread/default.nix b/pkgs/os-specific/darwin/apple-source-releases/libpthread/default.nix
index 50794814aa0f..c9d4b654a589 100644
--- a/pkgs/os-specific/darwin/apple-source-releases/libpthread/default.nix
+++ b/pkgs/os-specific/darwin/apple-source-releases/libpthread/default.nix
@@ -9,9 +9,11 @@ appleDerivation {
     mkdir -p $out/include/pthread/
     mkdir -p $out/include/sys/_types
     cp pthread/*.h $out/include/pthread/
-    cp private/*.h $out/include/pthread/
+
+    # This overwrites qos.h, and is probably not necessary, but I'll leave it here for now
+    # cp private/*.h $out/include/pthread/
+
     cp -r sys $out/include
     cp -r sys/_pthread/*.h $out/include/sys/_types/
-
   '';
 }