diff --git a/src/sphinxnotes/strike/__init__.py b/src/sphinxnotes/strike/__init__.py
index 73a80b9..dbb9fb7 100644
--- a/src/sphinxnotes/strike/__init__.py
+++ b/src/sphinxnotes/strike/__init__.py
@@ -51,7 +51,7 @@ def strike_role(
             f'role {typ} is not supported for builder {builder.name}, fallback to text',
             location=(env.docname, lineno),
             type='strike',
-            subtype='unspported_builder',
+            subtype='unsupported_builder',
         )
         return [Text(unescape(text))], []