diff --git a/src/tengri_impl.rs b/src/tengri_impl.rs
index 177630c..3b3d1ea 100644
--- a/src/tengri_impl.rs
+++ b/src/tengri_impl.rs
@@ -715,16 +715,12 @@ impl<'a, O, A, B, I, F, G> Draw<O> for Map<O, A, B, I, F, G> where
     }
 }
 
-impl Default for PerfModel {
-    fn default () -> Self {
-        Self {
-            enabled: true,
-            clock:   quanta::Clock::new(),
-            used:    Default::default(),
-            window:  Default::default(),
-        }
-    }
-}
+impl_default!(PerfModel: Self {
+    enabled: true,
+    clock:   quanta::Clock::new(),
+    used:    Default::default(),
+    window:  Default::default(),
+});
 
 impl PerfModel {
     pub fn get_t0 (&self) -> Option<u64> {