diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index c3f814cc747e06..af42fd8df21486 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -1919,6 +1919,7 @@ def _write_end_record(self):
                              centDirSize, centDirOffset, len(self._comment))
         self.fp.write(endrec)
         self.fp.write(self._comment)
+        self.fp.truncate()
         self.fp.flush()
 
     def _fpclose(self, fp):