diff --git a/pkgs/applications/science/chemistry/siesta/default.nix b/pkgs/applications/science/chemistry/siesta/default.nix
index 4c3d1d4c1a7..f49b9d1f45f 100644
--- a/pkgs/applications/science/chemistry/siesta/default.nix
+++ b/pkgs/applications/science/chemistry/siesta/default.nix
@@ -16,6 +16,10 @@ stdenv.mkDerivation rec {
     sha256 = "0lz8rfl5xwdj17zn7a30ipi7cgjwqki21a7wg9rdg7iwx27bpnmg";
   };
 
+  postPatch = ''
+    substituteInPlace Src/siesta_init.F --replace '/bin/rm' 'rm'
+  '';
+
   passthru = {
     inherit mpi;
   };