diff --git a/zensical.toml b/zensical.toml
index bf6c88f..17942e1 100644
--- a/zensical.toml
+++ b/zensical.toml
@@ -44,7 +44,7 @@ Copyright © 2026 Paul Scherrer Institute
    ]},
    { "Tutorials" = [
         "tutorials/index.md",
-        { ":lucide-snowflake: Cooler Simulation" = "tutorials/cooler_simulation.md"}
+        { "lucide/snowflake" "Cooler Simulation" = "tutorials/cooler_simulation.md"}
    ]},
    { "Recipes and Guides" = [
         "stepbystep/index.md"