diff --git a/.changeset/thirty-eyes-film.md b/.changeset/thirty-eyes-film.md
new file mode 100644
index 00000000..62662496
--- /dev/null
+++ b/.changeset/thirty-eyes-film.md
@@ -0,0 +1,5 @@
+---
+'pockethost': patch
+---
+
+Minor fix to GetOrProvisionInstanceUrl filter
diff --git a/packages/pockethost/src/common/plugin/filter.ts b/packages/pockethost/src/common/plugin/filter.ts
index 0d137506..196e30ba 100644
--- a/packages/pockethost/src/common/plugin/filter.ts
+++ b/packages/pockethost/src/common/plugin/filter.ts
@@ -143,12 +143,8 @@ export const [
   doGetOrProvisionInstanceUrlFilter,
   onGetOrProvisionInstanceUrlFilter,
 ] = createCustomFilterWithContext<
-  string,
+  string | undefined,
   {
-    req: Request
-    res: Response
-    host: string
-    subdomain: string
     instance: InstanceFields
   }
 >(CoreFilters.GetOrProvisionInstanceUrl)