diff --git a/pkgs/shells/tcsh/default.nix b/pkgs/shells/tcsh/default.nix
index be182f87f1e..764ea64f3ce 100644
--- a/pkgs/shells/tcsh/default.nix
+++ b/pkgs/shells/tcsh/default.nix
@@ -19,4 +19,8 @@ stdenv.mkDerivation rec {
     homepage = http://www.tcsh.org/;
     description = "An enhanced version of the Berkeley UNIX C shell (csh)";
   };
+
+  passthru = {
+    shellPath = "/bin/tcsh";
+  };
 }