diff --git a/pkgs/tools/misc/expect/default.nix b/pkgs/tools/misc/expect/default.nix
index 4a6f62f995b..6c9f348b8a1 100644
--- a/pkgs/tools/misc/expect/default.nix
+++ b/pkgs/tools/misc/expect/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "format" ];
 
-  postPatch = ''
+  preConfigure = ''
     sed -i "s,/bin/stty,$(type -p stty),g" configure
   '';