diff --git a/jwt-authorizer/src/authorizer.rs b/jwt-authorizer/src/authorizer.rs
index 6f82e64..825c5b3 100644
--- a/jwt-authorizer/src/authorizer.rs
+++ b/jwt-authorizer/src/authorizer.rs
@@ -13,33 +13,14 @@ use crate::{
     oidc, Refresh, RegisteredClaims,
 };
 
-pub trait ClaimsChecker<C> {
-    fn check(&self, claims: &C) -> bool;
-}
-
-#[derive(Clone)]
-pub struct FnClaimsChecker<C>
-where
-    C: Clone + Send + Sync,
-{
-    pub checker_fn: Arc<Box<dyn Fn(&C) -> bool + Send + Sync>>,
-}
-
-impl<C> ClaimsChecker<C> for FnClaimsChecker<C>
-where
-    C: Clone + Send + Sync,
-{
-    fn check(&self, claims: &C) -> bool {
-        (self.checker_fn)(claims)
-    }
-}
+pub type ClaimsCheckerFn<C> = Arc<Box<dyn Fn(&C) -> bool + Send + Sync>>;
 
 pub struct Authorizer<C = RegisteredClaims>
 where
     C: Clone + Send,
 {
     pub key_source: KeySource,
-    pub claims_checker: Option<FnClaimsChecker<C>>,
+    pub claims_checker: Option<ClaimsCheckerFn<C>>,
     pub validation: crate::validation::Validation,
     pub jwt_source: JwtSource,
 }
@@ -70,7 +51,7 @@ where
 {
     pub(crate) async fn build(
         key_source_type: KeySourceType,
-        claims_checker: Option<FnClaimsChecker<C>>,
+        claims_checker: Option<ClaimsCheckerFn<C>>,
         refresh: Option<Refresh>,
         validation: crate::validation::Validation,
         jwt_source: JwtSource,
@@ -212,7 +193,7 @@ where
         let token_data = decode::<C>(token, &val_key.key, jwt_validation)?;
 
         if let Some(ref checker) = self.claims_checker {
-            if !checker.check(&token_data.claims) {
+            if !checker(&token_data.claims) {
                 return Err(AuthError::InvalidClaims());
             }
         }
diff --git a/jwt-authorizer/src/builder.rs b/jwt-authorizer/src/builder.rs
index ab3dc34..925d532 100644
--- a/jwt-authorizer/src/builder.rs
+++ b/jwt-authorizer/src/builder.rs
@@ -3,7 +3,7 @@ use std::sync::Arc;
 use serde::de::DeserializeOwned;
 
 use crate::{
-    authorizer::{FnClaimsChecker, KeySourceType},
+    authorizer::{ClaimsCheckerFn, KeySourceType},
     error::InitError,
     layer::{AuthorizationLayer, JwtSource},
     Authorizer, Refresh, RefreshStrategy, RegisteredClaims, Validation,
@@ -19,7 +19,7 @@ where
 {
     key_source_type: KeySourceType,
     refresh: Option<Refresh>,
-    claims_checker: Option<FnClaimsChecker<C>>,
+    claims_checker: Option<ClaimsCheckerFn<C>>,
     validation: Option<Validation>,
     jwt_source: JwtSource,
 }
@@ -158,9 +158,7 @@ where
     where
         F: Fn(&C) -> bool + Send + Sync + 'static,
     {
-        self.claims_checker = Some(FnClaimsChecker {
-            checker_fn: Arc::new(Box::new(checker_fn)),
-        });
+        self.claims_checker = Some(Arc::new(Box::new(checker_fn)));
 
         self
     }