diff --git a/release.nix b/release.nix
index ab677f3b..0fe68351 100644
--- a/release.nix
+++ b/release.nix
@@ -74,8 +74,8 @@ let
             mkdir -p $out/lib
             cp -pd ${boost}/lib/{libboost_context*,libboost_thread*,libboost_system*} $out/lib
             rm -f $out/lib/*.a
-            chmod u+w $out/lib/*.so.*
             ${lib.optionalString stdenv.isLinux ''
+              chmod u+w $out/lib/*.so.*
               patchelf --set-rpath $out/lib:${stdenv.cc.cc.lib}/lib $out/lib/libboost_thread.so.*
             ''}
           '';