diff --git a/flake8_black.py b/flake8_black.py
index 6b88faa..7b8a348 100644
--- a/flake8_black.py
+++ b/flake8_black.py
@@ -99,7 +99,7 @@ def _file_mode(self):
         # Unless using override, we look for pyproject.toml
         project_root = black.find_project_root(
             ("." if self.filename in self.STDIN_NAMES else self.filename,)
-        )
+        )[0]
         path = project_root / "pyproject.toml"
 
         if path in black_config: