diff --git a/amplify/agent/common/util/backoff.py b/amplify/agent/common/util/backoff.py
index 0e95fc8..6e7d011 100644
--- a/amplify/agent/common/util/backoff.py
+++ b/amplify/agent/common/util/backoff.py
@@ -32,4 +32,4 @@ def exponential_delay(n):
         (EXPONENTIAL_COEFFICIENT ** n)
     period_size = min(exponential_limit, MAXIMUM_TIMEOUT)
 
-    return randint(0, period_size - 1)
+    return randint(0, int(period_size) - 1)