diff --git a/remotefilelog/__init__.py b/remotefilelog/__init__.py
--- a/remotefilelog/__init__.py
+++ b/remotefilelog/__init__.py
@@ -152,7 +152,8 @@
             # Replace remote.stream_out with a version that sends file
             # patterns.
             def stream_out_shallow(orig):
-                if shallowrepo.requirement in remote._capabilities():
+                caps = shallowutil.peercapabilities(remote)
+                if shallowrepo.requirement in caps:
                     opts = {}
                     if repo.includepattern:
                         opts['includepattern'] = '\0'.join(repo.includepattern)
diff --git a/remotefilelog/fileserverclient.py b/remotefilelog/fileserverclient.py
--- a/remotefilelog/fileserverclient.py
+++ b/remotefilelog/fileserverclient.py
@@ -64,7 +64,7 @@
         def _updatecallstreamopts(self, command, opts):
             if command != 'getbundle':
                 return
-            if 'remotefilelog' not in self._capabilities():
+            if 'remotefilelog' not in shallowutil.peercapabilities(self):
                 return
             if not util.safehasattr(self, '_localrepo'):
                 return
diff --git a/remotefilelog/remotefilelogserver.py b/remotefilelog/remotefilelogserver.py
--- a/remotefilelog/remotefilelogserver.py
+++ b/remotefilelog/remotefilelogserver.py
@@ -193,7 +193,11 @@
             caps.append('getflogheads')
             caps.append('getfile')
         return caps
-    wrapfunction(wireproto, '_capabilities', _capabilities)
+    if util.safehasattr(wireproto, '_capabilities'):
+        wrapfunction(wireproto, '_capabilities', _capabilities)
+    else:
+        # renamed by upstream 1f8460b55986d405a3a6dff1597c4dbad072e7da
+        wrapfunction(wireproto, 'capabilities', _capabilities)
 
     def _adjustlinkrev(orig, self, *args, **kwargs):
         # When generating file blobs, taking the real path is too slow on large
diff --git a/remotefilelog/shallowutil.py b/remotefilelog/shallowutil.py
--- a/remotefilelog/shallowutil.py
+++ b/remotefilelog/shallowutil.py
@@ -463,3 +463,6 @@
             setstickygroupdir(path, gid, ui.warn)
     finally:
         os.umask(oldumask)
+
+def peercapabilities(peer):
+    return getattr(peer, '_capabilities', getattr(peer, 'capabilities'))()