diff --git a/PyFlyt/core/aviary.py b/PyFlyt/core/aviary.py
index b04c0bbe..35b21b36 100644
--- a/PyFlyt/core/aviary.py
+++ b/PyFlyt/core/aviary.py
@@ -415,7 +415,7 @@ def step(self):
             elapsed = time.time() - self.now
             self.now = time.time()
 
-            self._sim_elapsed += self.update_period * self.updates_per_step
+            self._sim_elapsed += self.update_period
             self._frame_elapsed += elapsed
 
             time.sleep(max(self._sim_elapsed - self._frame_elapsed, 0.0))