diff --git a/hgext/largefiles/overrides.py b/hgext/largefiles/overrides.py
--- a/hgext/largefiles/overrides.py
+++ b/hgext/largefiles/overrides.py
@@ -968,7 +968,7 @@ def getoutgoinglfiles(ui, repo, dest=Non
         return None
     o = lfutil.findoutgoing(repo, remote, False)
     if not o:
-        return None
+        return o
     o = repo.changelog.nodesbetween(o, revs)[0]
     if opts.get('newest_first'):
         o.reverse()
@@ -1002,6 +1002,8 @@ def overrideoutgoing(orig, ui, repo, des
         toupload = getoutgoinglfiles(ui, repo, dest, **opts)
         if toupload is None:
             ui.status(_('largefiles: No remote repo\n'))
+        elif not toupload:
+            ui.status(_('largefiles: no files to upload\n'))
         else:
             ui.status(_('largefiles to upload:\n'))
             for file in toupload:
@@ -1021,6 +1023,8 @@ def overridesummary(orig, ui, repo, *pat
         toupload = getoutgoinglfiles(ui, repo, None, **opts)
         if toupload is None:
             ui.status(_('largefiles: No remote repo\n'))
+        elif not toupload:
+            ui.status(_('largefiles: (no files to upload)\n'))
         else:
             ui.status(_('largefiles: %d to upload\n') % len(toupload))
 
diff --git a/tests/test-largefiles.t b/tests/test-largefiles.t
--- a/tests/test-largefiles.t
+++ b/tests/test-largefiles.t
@@ -1627,3 +1627,87 @@ Test commit's addremove option prior to 
   .hglf/large2.dat
 
   $ cd ..
+
+issue3651: summary/outgoing with largefiles shows "no remote repo"
+unexpectedly
+
+  $ mkdir issue3651
+  $ cd issue3651
+
+  $ hg init src
+  $ echo a > src/a
+  $ hg -R src add --large src/a
+  $ hg -R src commit -m '#0'
+  Invoking status precommit hook
+  A a
+
+check messages when no remote repository is specified:
+"no remote repo" route for "hg outgoing --large" is not tested here,
+because it can't be reproduced easily.
+
+  $ hg init clone1
+  $ hg -R clone1 -q pull src
+  $ hg -R clone1 -q update
+  $ hg -R clone1 paths | grep default
+  [1]
+
+  $ hg -R clone1 summary --large
+  parent: 0:fc0bd45326d3 tip
+   #0
+  branch: default
+  commit: (clean)
+  update: (current)
+  largefiles: No remote repo
+
+check messages when there is no files to upload:
+
+  $ hg -q clone src clone2
+  $ hg -R clone2 paths | grep default
+  default = $TESTTMP/issue3651/src
+
+  $ hg -R clone2 summary --large
+  parent: 0:fc0bd45326d3 tip
+   #0
+  branch: default
+  commit: (clean)
+  update: (current)
+  searching for changes
+  largefiles: (no files to upload)
+  $ hg -R clone2 outgoing --large
+  comparing with $TESTTMP/issue3651/src
+  searching for changes
+  no changes found
+  searching for changes
+  largefiles: no files to upload
+  [1]
+
+check messages when there are files to upload:
+
+  $ echo b > clone2/b
+  $ hg -R clone2 add --large clone2/b
+  $ hg -R clone2 commit -m '#1'
+  Invoking status precommit hook
+  A b
+  $ hg -R clone2 summary --large
+  parent: 1:1acbe71ce432 tip
+   #1
+  branch: default
+  commit: (clean)
+  update: (current)
+  searching for changes
+  largefiles: 1 to upload
+  $ hg -R clone2 outgoing --large
+  comparing with $TESTTMP/issue3651/src
+  searching for changes
+  changeset:   1:1acbe71ce432
+  tag:         tip
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     #1
+  
+  searching for changes
+  largefiles to upload:
+  b
+  
+
+  $ cd ..