diff --git a/pyupgrade/_plugins/defauldict_lambda.py b/pyupgrade/_plugins/defaultdict_lambda.py
similarity index 100%
rename from pyupgrade/_plugins/defauldict_lambda.py
rename to pyupgrade/_plugins/defaultdict_lambda.py
diff --git a/tests/features/defauldict_lambda_test.py b/tests/features/defaultdict_lambda_test.py
similarity index 100%
rename from tests/features/defauldict_lambda_test.py
rename to tests/features/defaultdict_lambda_test.py