diff --git a/mkdocs.yml b/mkdocs.yml
index e8df450..015c8a0 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -17,7 +17,7 @@ theme:
     - media: "(prefers-color-scheme: dark)"
       scheme: slate
       toggle:
-        icon: purple_circle
+        icon: material/circle
         name: Switch to light mode
       primary: purple
       accent: purple