diff -r 454bc51f114c -r f0027a3dd7cb mercurial/localrepo.py
--- a/mercurial/localrepo.py	Wed Feb 19 13:39:00 2020 +0530
+++ b/mercurial/localrepo.py	Wed Feb 19 17:30:04 2020 +0100
@@ -3578,14 +3578,17 @@
             if ui.configbool(b'format', b'dotencode'):
                 requirements.add(b'dotencode')
 
-    compengine = ui.config(b'format', b'revlog-compression')
-    if compengine not in util.compengines:
+    compengines = ui.configlist(b'format', b'revlog-compression')
+    for compengine in compengines:
+        if compengine in util.compengines:
+            break
+    else:
         raise error.Abort(
             _(
-                b'compression engine %s defined by '
+                b'compression engines %s defined by '
                 b'format.revlog-compression not available'
             )
-            % compengine,
+            % b', '.join(b'"%s"' % e for e in compengines),
             hint=_(
                 b'run "hg debuginstall" to list available '
                 b'compression engines'
@@ -3593,7 +3596,7 @@
         )
 
     # zlib is the historical default and doesn't need an explicit requirement.
-    elif compengine == b'zstd':
+    if compengine == b'zstd':
         requirements.add(b'revlog-compression-zstd')
     elif compengine != b'zlib':
         requirements.add(b'exp-compression-%s' % compengine)