diff --git a/envschema/formatters.py b/envschema/formatters.py
index da0cbe7..fee3e82 100644
--- a/envschema/formatters.py
+++ b/envschema/formatters.py
@@ -1,7 +1,6 @@
 """Output formatters for validation results."""
 
 import json
-from typing import Optional
 
 from envschema.core import ValidationResult