diff --git a/remotefilelog/repack.py b/remotefilelog/repack.py
--- a/remotefilelog/repack.py
+++ b/remotefilelog/repack.py
@@ -16,6 +16,7 @@
     short,
 )
 from mercurial.i18n import _
+from mercurial.utils import procutil
 from . import (
     constants,
     contentstore,
@@ -46,7 +47,7 @@
         msg = _("(running background incremental repack)\n")
     if packsonly:
         cmd.append('--packsonly')
-    cmd = ' '.join(map(util.shellquote, cmd))
+    cmd = ' '.join(map(procutil.shellquote, cmd))
 
     repo.ui.warn(msg)
     runshellcommand(cmd, os.environ)
diff --git a/remotefilelog/shallowrepo.py b/remotefilelog/shallowrepo.py
--- a/remotefilelog/shallowrepo.py
+++ b/remotefilelog/shallowrepo.py
@@ -9,6 +9,7 @@
 from mercurial.i18n import _
 from mercurial.node import hex, nullid, nullrev
 from mercurial import error, localrepo, util, match, scmutil
+from mercurial.utils import procutil
 from . import (
     connectionpool,
     fileserverclient,
@@ -194,7 +195,7 @@
                 cmd.append('--repack')
             if revs:
                 cmd += ['-r', revs]
-            cmd = ' '.join(map(util.shellquote, cmd))
+            cmd = ' '.join(map(procutil.shellquote, cmd))
 
             runshellcommand(cmd, os.environ)