diff --git a/swap/tests/rpc.rs b/swap/tests/rpc.rs
index c28c0331..553ccf46 100644
--- a/swap/tests/rpc.rs
+++ b/swap/tests/rpc.rs
@@ -79,7 +79,7 @@ mod test {
     }
 
     // Helper function for HashMap
-    fn assert_has_keys_hashmap(map: &HashMap<String, Value>, keys: &[&str]) {
+    fn assert_has_keys_hashmap<T>(map: &HashMap<String, T>, keys: &[&str]) {
         for &key in keys {
             assert!(map.contains_key(key), "Key {} is missing", key);
         }