diff --git a/ci_boost_release.py b/ci_boost_release.py
index 9151e13..41895dd 100644
--- a/ci_boost_release.py
+++ b/ci_boost_release.py
@@ -774,8 +774,8 @@ def command_build(self):
                     "7z",
                     "a",
                     "-bd",
-                    "-mx=7",
-                    "-mmt2",
+                    "-mx=1",
+                    "-mmt1",
                     "-ms=on",
                     "-x!" + self.boost_release_name + "/ci_boost_common.py",
                     "-x!" + self.boost_release_name + "/ci_boost_release.py",