diff --git a/edu-ws/src/token/sso.rs b/edu-ws/src/token/sso.rs
index 093d2c2..5efc11e 100644
--- a/edu-ws/src/token/sso.rs
+++ b/edu-ws/src/token/sso.rs
@@ -19,7 +19,7 @@ impl Signature {
     fn from(site_url: &Url, passport: f64) -> Self {
         let mut context = md5::Context::new();
         context.consume(site_url.as_str().trim_end_matches('/'));
-        context.consume(&passport.to_string());
+        context.consume(passport.to_string());
         Self(context.compute().into())
     }
 }