diff --git a/jwt-authorizer/src/layer.rs b/jwt-authorizer/src/layer.rs
index 7e3884a..de97bce 100644
--- a/jwt-authorizer/src/layer.rs
+++ b/jwt-authorizer/src/layer.rs
@@ -209,8 +209,9 @@ where
 }
 
 #[async_trait]
-impl<C> IntoLayer<C> for Vec<JwtAuthorizer<C>>
+impl<C, T> IntoLayer<C> for T
 where
+    T: IntoIterator<Item = JwtAuthorizer<C>> + Send + Sync,
     C: Clone + DeserializeOwned + Send + Sync,
 {
     async fn into_layer(self) -> Result<AsyncAuthorizationLayer<C>, InitError> {
diff --git a/jwt-authorizer/tests/tests.rs b/jwt-authorizer/tests/tests.rs
index 74f7162..2a07020 100644
--- a/jwt-authorizer/tests/tests.rs
+++ b/jwt-authorizer/tests/tests.rs
@@ -352,7 +352,7 @@ mod tests {
             proteced_request_with_header(auths, header::COOKIE.as_str(), &format!("ccc={}", common::JWT_RSA1_OK)).await;
         assert_eq!(response.status(), StatusCode::OK);
 
-        let auths: Vec<JwtAuthorizer<User>> = vec![
+        let auths: [JwtAuthorizer<User>; 2] = [
             JwtAuthorizer::from_ec_pem("../config/ecdsa-public1.pem"),
             JwtAuthorizer::from_rsa_pem("../config/rsa-public1.pem").jwt_source(JwtSource::Cookie("ccc".to_owned())),
         ];