diff --git a/lib/oauth2/access_token.ex b/lib/oauth2/access_token.ex
index 493474d..65f7bd4 100644
--- a/lib/oauth2/access_token.ex
+++ b/lib/oauth2/access_token.ex
@@ -29,6 +29,7 @@ defmodule OAuth2.AccessToken do
           other_params: other_params
         }
 
+  @derive {Inspect, except: [:access_token, :refresh_token]}
   defstruct access_token: "",
             refresh_token: nil,
             expires_at: nil,
diff --git a/lib/oauth2/client.ex b/lib/oauth2/client.ex
index 59beb12..c264c09 100644
--- a/lib/oauth2/client.ex
+++ b/lib/oauth2/client.ex
@@ -65,6 +65,7 @@ defmodule OAuth2.Client do
           token_url: token_url
         }
 
+  @derive {Inspect, except: [:client_secret]}
   defstruct authorize_url: "/oauth/authorize",
             client_id: "",
             client_secret: "",