diff --git a/vmtools/pkgs/triton-vmtools.nix b/vmtools/pkgs/triton-vmtools.nix
index 5df459e..d6f4e6d 100644
--- a/vmtools/pkgs/triton-vmtools.nix
+++ b/vmtools/pkgs/triton-vmtools.nix
@@ -35,7 +35,7 @@ stdenv.mkDerivation rec {
     cp -r ''${sdcvmtools}/usr/share/man/man1/mdata-* $out/share/man/man1/
   '';
 
-  preFixup = ''
+  postFixup = ''
     for file in $out/lib/smartdc/*
     do
       substituteInPlace ''$file \