diff --git a/src/utils/body.ts b/src/utils/body.ts
index 76024deb..11d7f3a3 100644
--- a/src/utils/body.ts
+++ b/src/utils/body.ts
@@ -165,7 +165,7 @@ export async function readBodySafe<TSchema extends Schema<unknown>>(
     return (event.node.req as any)[ParsedBodySymbol] as Infer<typeof schema>;
   }
   const contentType = getRequestHeader(event, "content-type");
-  if (contentType === "application/x-www-form-urlencoded") {
+  if (contentType?.startsWith("application/x-www-form-urlencoded")) {
     const formPayload = Object.fromEntries(await readFormData(event));
     const result = await assertSchema(schema, formPayload, onError);
     (event.node.req as any)[ParsedBodySymbol] = result;