--- a/mercurial/utils/compression.py	Wed Mar 27 19:34:10 2019 +0100
+++ b/mercurial/utils/compression.py	Wed Mar 27 18:35:27 2019 +0100
@@ -505,7 +505,10 @@
                                          stringutil.forcebytestr(e))
 
     def revlogcompressor(self, opts=None):
-        return self.zlibrevlogcompressor()
+        level = None
+        if opts is not None:
+            level = opts.get('zlib.level')
+        return self.zlibrevlogcompressor(level)
 
 compengines.register(_zlibengine())