diff --git a/ultimatepython/advanced/async.py b/ultimatepython/advanced/async.py
index d7efbc5..e52b739 100644
--- a/ultimatepython/advanced/async.py
+++ b/ultimatepython/advanced/async.py
@@ -12,7 +12,7 @@
 from uuid import uuid4
 
 # Module-level constants
-_DELAY_SMALL = .001
+_DELAY_SMALL = 0.001
 _DELAY_LARGE = 3600
 
 
diff --git a/ultimatepython/advanced/benchmark.py b/ultimatepython/advanced/benchmark.py
index 386f95b..d33195f 100644
--- a/ultimatepython/advanced/benchmark.py
+++ b/ultimatepython/advanced/benchmark.py
@@ -11,7 +11,7 @@
 import time
 
 # Module-level constants
-_SLEEP_DURATION = .001
+_SLEEP_DURATION = 0.001
 
 
 def finish_slower():