diff --git a/hosts/mars/hermes-agent.nix b/hosts/mars/hermes-agent.nix
index 5151219..bcbb81e 100644
--- a/hosts/mars/hermes-agent.nix
+++ b/hosts/mars/hermes-agent.nix
@@ -85,6 +85,10 @@ let
     url = "https://github.com/KittenML/KittenTTS/releases/download/0.8.1/kittentts-0.8.1-py3-none-any.whl";
     sha256 = "sha256-SCpDbE8fMZIVNxA3bkWf82iVF+vNp8KwUeL9QYe0GFE=";
   };
+  # uv parses the version out of the filename; the store hash prefix breaks it.
+  kittenttsWheelFile = "${pkgs.linkFarm "kittentts-wheel" {
+    "kittentts-0.8.1-py3-none-any.whl" = kittenttsWheel;
+  }}/kittentts-0.8.1-py3-none-any.whl";
   kittenttsReqs = pkgs.writeText "kittentts-requirements.txt" (
     builtins.readFile ./kittentts/requirements.txt
   );
@@ -619,7 +623,7 @@ in
         # the CUDA tree; the requirements freeze already covers its real needs.
         UV_CACHE_DIR=$stageDir/uv-cache \
           uv pip install --python "$stageVenv/bin/python" --quiet --no-deps \
-            ${kittenttsWheel}
+            ${kittenttsWheelFile}
 
         # Dead-import shim: .pth auto-loads kitten_tts_stub at interpreter
         # start so `from misaki import en, espeak` resolves without the real