diff --git a/.changeset/small-turtles-relax.md b/.changeset/small-turtles-relax.md
new file mode 100644
index 00000000..68daed3c
--- /dev/null
+++ b/.changeset/small-turtles-relax.md
@@ -0,0 +1,5 @@
+---
+'@hono/standard-validator': patch
+---
+
+Remove dead code
diff --git a/packages/standard-validator/src/index.ts b/packages/standard-validator/src/index.ts
index e22efd7c..2df2bfd9 100644
--- a/packages/standard-validator/src/index.ts
+++ b/packages/standard-validator/src/index.ts
@@ -21,9 +21,6 @@ type Hook<
   c: Context<E, P>
 ) => TOrPromiseOfT<Response | void | TypedResponse<O>>
 
-const isStandardSchemaValidator = (validator: unknown): validator is StandardSchemaV1 =>
-  !!validator && typeof validator === 'object' && '~standard' in validator
-
 const sValidator = <
   Schema extends StandardSchemaV1,
   Target extends keyof ValidationTargets,