diff --git a/default.nix b/default.nix
index 41915ef..e6d3a2f 100644
--- a/default.nix
+++ b/default.nix
@@ -20,6 +20,7 @@ in
     installPhase = ''
       mkdir -p $out $out/katex $out/katex-expression $out/bergamot
       cp ${yarnModules}/node_modules/katex/dist/katex.min.css $out/katex
+      cp -r ${yarnModules}/node_modules/katex/dist/fonts $out/katex
       cp ${yarnModules}/node_modules/@navsnpm/katex-expression/dist/katex-expression/katex-expression.esm.js $out/katex-expression
       cp ${bergamot-elm}/Main.min.js $out/bergamot/bergamot.js
     '';