diff --git a/pre_commit_hooks/check_executables_have_shebangs.py b/pre_commit_hooks/check_executables_have_shebangs.py
index 025e7e7..96d1e1e 100644
--- a/pre_commit_hooks/check_executables_have_shebangs.py
+++ b/pre_commit_hooks/check_executables_have_shebangs.py
@@ -23,7 +23,7 @@ def zsplit(s: str) -> List[str]:
 
 def check_executables(paths: List[str]) -> int:
     if (
-        sys.platform == "win32" or "microsoft" in platform.uname()[3].lower()
+        sys.platform == 'win32' or 'microsoft' in platform.uname()[3].lower()
     ):  # pragma: win32 cover
         return _check_git_filemode(paths)
     else:  # pragma: win32 no cover