diff --git a/src/gatekeeper.rs b/src/gatekeeper.rs
index 3e7b397..4f381c8 100644
--- a/src/gatekeeper.rs
+++ b/src/gatekeeper.rs
@@ -43,7 +43,7 @@ impl TokenCreator {
     let mut scopes_map: Map<String, Value> = Map::new();
 
     for (key, values_raw) in scopes {
-      let values = values_raw.iter().map(|v| Value::String(v.to_string())).collect();
+      let values = values_raw.iter().map(|&v| Value::String(v.to_string())).collect();
       scopes_map.insert(key.to_string(), Value::Array(values));
     }