diff --git a/pyproject.toml b/pyproject.toml
index de95529..2906c95 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -104,7 +104,7 @@ select = ["E", "F", "W", "I", "N", "UP", "B", "C4", "SIM", "TCH"]
 ignore = ["E501", "B008", "N805"]
 
 [tool.ruff.lint.per-file-ignores]
-"tests/**" = ["F401", "F841", "I001", "N806", "TCH", "TC003"]
+"tests/**" = ["E402", "F401", "F841", "I001", "N806", "TCH", "TC003"]
 
 [tool.ruff.lint.isort]
 known-first-party = ["phalanx"]