diff --git a/pdfplumber/repair.py b/pdfplumber/repair.py
index af0f132..64f91dd 100644
--- a/pdfplumber/repair.py
+++ b/pdfplumber/repair.py
@@ -11,8 +11,12 @@ def _repair(
     gs_path: Optional[Union[str, pathlib.Path]] = None,
 ) -> BytesIO:
 
-    executable = (gs_path or shutil.which("gs") or shutil.which("gswin32c")
-                  or shutil.which("gswin64c"))
+    executable = (
+        gs_path
+        or shutil.which("gs")
+        or shutil.which("gswin32c")
+        or shutil.which("gswin64c")
+    )
     if executable is None:  # pragma: nocover
         raise Exception(
             "Cannot find Ghostscript, which is required for repairs.\n"