diff --git a/setup/install.py b/setup/install.py
index fbdc014134..b3854ec36c 100644
--- a/setup/install.py
+++ b/setup/install.py
@@ -339,7 +339,7 @@ class Sdist(Command):
         self.info('\tCreating tarfile...')
         dest = self.DEST.rpartition('.')[0]
         shutil.rmtree(os.path.join(tdir, '.github'))
-        subprocess.check_call(['tar', '-cf', self.a(dest), 'calibre-%s' % __version__], cwd=self.d(tdir))
+        subprocess.check_call(['tar', '--mtime=@0', '-cf', self.a(dest), 'calibre-%s' % __version__], cwd=self.d(tdir))
         self.info('\tCompressing tarfile...')
         if os.path.exists(self.a(self.DEST)):
             os.remove(self.a(self.DEST))