diff --git a/pkgs/applications/misc/wordnet/default.nix b/pkgs/applications/misc/wordnet/default.nix
index 6ead69db2209..d46790e4d72b 100644
--- a/pkgs/applications/misc/wordnet/default.nix
+++ b/pkgs/applications/misc/wordnet/default.nix
@@ -37,5 +37,6 @@ stdenv.mkDerivation {
 
     maintainers = [ ];
     platforms = stdenv.lib.platforms.gnu;  # arbitrary choice
+    broken = true;  # we'd need older tk/tcl
   };
 }