diff --git a/src/params/persist.rs b/src/params/persist.rs
index 1363e7b4..54e48084 100644
--- a/src/params/persist.rs
+++ b/src/params/persist.rs
@@ -72,6 +72,21 @@ where
     }
 }
 
+impl<'a, T> PersistentField<'a, T> for atomic_refcell::AtomicRefCell<T>
+where
+    T: serde::Serialize + serde::Deserialize<'a> + Send + Sync,
+{
+    fn set(&self, new_value: T) {
+        *self.borrow_mut() = new_value;
+    }
+    fn map<F, R>(&self, f: F) -> R
+    where
+        F: Fn(&T) -> R,
+    {
+        f(&self.borrow())
+    }
+}
+
 macro_rules! impl_persistent_field_parking_lot_mutex {
     ($ty:ty) => {
         impl<'a, T> PersistentField<'a, T> for $ty
@@ -91,21 +106,6 @@ macro_rules! impl_persistent_field_parking_lot_mutex {
     };
 }
 
-impl<'a, T> PersistentField<'a, T> for atomic_refcell::AtomicRefCell<T>
-where
-    T: serde::Serialize + serde::Deserialize<'a> + Send + Sync,
-{
-    fn set(&self, new_value: T) {
-        *self.borrow_mut() = new_value;
-    }
-    fn map<F, R>(&self, f: F) -> R
-    where
-        F: Fn(&T) -> R,
-    {
-        f(&self.borrow())
-    }
-}
-
 impl_persistent_field_parking_lot_mutex!(parking_lot::Mutex<T>);
 impl_persistent_field_parking_lot_mutex!(parking_lot::FairMutex<T>);