diff --git a/src/client/mod.rs b/src/client/mod.rs
index 69013d1..fc60864 100644
--- a/src/client/mod.rs
+++ b/src/client/mod.rs
@@ -76,7 +76,7 @@ impl<P: Provider> Client<P> {
     ///     None
     /// );
     /// ```
-    pub fn auth_uri(&self, scope: Option<&str>, state: Option<&str>) -> Result<String, ClientError>
+    pub fn auth_uri(&self, scope: Option<&str>, state: Option<&str>) -> Result<Url, ClientError>
     {
         let mut uri = try!(Url::parse(P::auth_uri()));
 
@@ -96,7 +96,7 @@ impl<P: Provider> Client<P> {
 
         uri.set_query_from_pairs(query_pairs.iter());
 
-        Ok(uri.serialize())
+        Ok(uri)
     }
 
     fn post_token<'a>(
@@ -209,7 +209,7 @@ mod tests {
         let client = Client::<Test>::new(String::from("foo"), String::from("bar"), None);
         assert_eq!(
             "http://example.com/oauth2/auth?response_type=code&client_id=foo",
-            client.auth_uri(None, None).unwrap()
+            client.auth_uri(None, None).unwrap().serialize()
         );
     }
 
@@ -222,7 +222,7 @@ mod tests {
         );
         assert_eq!(
             "http://example.com/oauth2/auth?response_type=code&client_id=foo&redirect_uri=http%3A%2F%2Fexample.com%2Foauth2%2Fcallback",
-            client.auth_uri(None, None).unwrap()
+            client.auth_uri(None, None).unwrap().serialize()
         );
     }
 
@@ -231,7 +231,7 @@ mod tests {
         let client = Client::<Test>::new(String::from("foo"), String::from("bar"), None);
         assert_eq!(
             "http://example.com/oauth2/auth?response_type=code&client_id=foo&scope=baz",
-            client.auth_uri(Some("baz"), None).unwrap()
+            client.auth_uri(Some("baz"), None).unwrap().serialize()
         );
     }
 
@@ -240,7 +240,7 @@ mod tests {
         let client = Client::<Test>::new(String::from("foo"), String::from("bar"), None);
         assert_eq!(
             "http://example.com/oauth2/auth?response_type=code&client_id=foo&state=baz",
-            client.auth_uri(None, Some("baz")).unwrap()
+            client.auth_uri(None, Some("baz")).unwrap().serialize()
         );
     }
 }
diff --git a/tests/auth_uri.rs b/tests/auth_uri.rs
index c31ff32..7ffd9bc 100644
--- a/tests/auth_uri.rs
+++ b/tests/auth_uri.rs
@@ -1,10 +1,12 @@
 extern crate hyper;
 extern crate inth_oauth2;
+extern crate url;
 
 use inth_oauth2::Client;
 use inth_oauth2::provider::*;
+use url::Url;
 
-fn assert_get_uri_ok(uri: &str) {
+fn assert_get_uri_ok(uri: Url) {
     let client = hyper::Client::new();
     let response = client.get(uri).send().unwrap();
     assert_eq!(hyper::Ok, response.status);
@@ -21,7 +23,7 @@ fn google_web_auth_uri_ok() {
         Some("https://www.googleapis.com/auth/userinfo.email"),
         Some("state"),
     ).unwrap();
-    assert_get_uri_ok(&auth_uri);
+    assert_get_uri_ok(auth_uri);
 }
 
 #[test]
@@ -35,7 +37,7 @@ fn google_installed_auth_uri_ok() {
         Some("https://www.googleapis.com/auth/userinfo.email"),
         Some("state")
     ).unwrap();
-    assert_get_uri_ok(&auth_uri);
+    assert_get_uri_ok(auth_uri);
 }
 
 #[test]
@@ -46,7 +48,7 @@ fn github_auth_uri_ok() {
         Some(String::from("https://cmcenroe.me/oauth2-paste/"))
     );
     let auth_uri = client.auth_uri(Some("user"), Some("state")).unwrap();
-    assert_get_uri_ok(&auth_uri);
+    assert_get_uri_ok(auth_uri);
 }
 
 #[test]
@@ -57,5 +59,5 @@ fn imgur_auth_uri_ok() {
         Some(String::from("https://cmcenroe.me/oauth2-paste/"))
     );
     let auth_uri = client.auth_uri(None, Some("state")).unwrap();
-    assert_get_uri_ok(&auth_uri);
+    assert_get_uri_ok(auth_uri);
 }