diff --git a/setup.py b/setup.py
index f0730dc..192c505 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ def run(self):
     if sys.platform.startswith('linux'):  # Just for linux, change the attributes
       for filepath in self.get_outputs():
         if filepath.find("LzmaCompress") > -1 or filepath.find("TianoCompress") > -1 or filepath.find("Brotli") > -1:
-          os.chmod(filepath, 0o777)
+          os.chmod(filepath, 0o755)  # executable, but not world-writable 
 
 
 if __name__ == "__main__":