diff --git a/src/authenticator_delegate.rs b/src/authenticator_delegate.rs
index 0ac916b..5312c13 100644
--- a/src/authenticator_delegate.rs
+++ b/src/authenticator_delegate.rs
@@ -140,7 +140,7 @@ pub trait FlowDelegate: Clone + Send + Sync {
     /// along with the `verification_url`.
     /// # Notes
     /// * Will be called exactly once, provided we didn't abort during `request_code` phase.
-    /// * Will only be called if the Authenticator's flow_type is `FlowType::Device`.
+    /// * Will only be called if the Authenticator's flow_type is `DeviceFlow`.
     fn present_user_code(&self, pi: &PollInformation) {
         println!(
             "Please enter {} at {} and grant access to this application",
diff --git a/src/device.rs b/src/device.rs
index 02f19c7..a924f17 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -13,7 +13,7 @@ use url::form_urlencoded;
 
 use crate::authenticator_delegate::{DefaultFlowDelegate, FlowDelegate, PollInformation, Retry};
 use crate::types::{
-    ApplicationSecret, Flow, FlowType, GetToken, JsonError, PollError, RequestError, Token,
+    ApplicationSecret, GetToken, JsonError, PollError, RequestError, Token,
 };
 
 pub const GOOGLE_DEVICE_CODE_URL: &'static str = "https://accounts.google.com/o/oauth2/device/code";
@@ -99,12 +99,6 @@ pub struct DeviceFlowImpl<FD, C> {
     wait: Duration,
 }
 
-impl<FD, C> Flow for DeviceFlowImpl<FD, C> {
-    fn type_id() -> FlowType {
-        FlowType::Device(String::new())
-    }
-}
-
 impl<FD, C> GetToken for DeviceFlowImpl<FD, C>
 where
     FD: FlowDelegate + 'static,
diff --git a/src/lib.rs b/src/lib.rs
index f83144e..523e703 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -101,6 +101,6 @@ pub use crate::installed::{InstalledFlow, InstalledFlowReturnMethod};
 pub use crate::service_account::*;
 pub use crate::storage::{DiskTokenStorage, MemoryStorage, NullStorage, TokenStorage};
 pub use crate::types::{
-    ApplicationSecret, ConsoleApplicationSecret, FlowType, GetToken, PollError, RefreshResult,
+    ApplicationSecret, ConsoleApplicationSecret, GetToken, PollError, RefreshResult,
     RequestError, Scheme, Token, TokenType,
 };
diff --git a/src/types.rs b/src/types.rs
index 3f96e14..a47a0fa 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -8,11 +8,6 @@ use std::str::FromStr;
 
 use futures::prelude::*;
 
-/// A marker trait for all Flows
-pub trait Flow {
-    fn type_id() -> FlowType;
-}
-
 #[derive(Deserialize, Debug)]
 pub struct JsonError {
     pub error: String,
@@ -323,24 +318,6 @@ impl Token {
     }
 }
 
-/// All known authentication types, for suitable constants
-#[derive(Clone)]
-pub enum FlowType {
-    /// [device authentication](https://developers.google.com/youtube/v3/guides/authentication#devices). Only works
-    /// for certain scopes.
-    /// Contains the device token URL; for google, that is
-    /// https://accounts.google.com/o/oauth2/device/code (exported as `GOOGLE_DEVICE_CODE_URL`)
-    Device(String),
-    /// [installed app flow](https://developers.google.com/identity/protocols/OAuth2InstalledApp). Required
-    /// for Drive, Calendar, Gmail...; Requires user to paste a code from the browser.
-    InstalledInteractive,
-    /// Same as InstalledInteractive, but uses a redirect: The OAuth provider redirects the user's
-    /// browser to a web server that is running on localhost. This may not work as well with the
-    /// Windows Firewall, but is more comfortable otherwise. The integer describes which port to
-    /// bind to (default: 8080)
-    InstalledRedirect(u16),
-}
-
 /// Represents either 'installed' or 'web' applications in a json secrets file.
 /// See `ConsoleApplicationSecret` for more information
 #[derive(Deserialize, Serialize, Clone, Default)]