diff --git a/hgext/largefiles/overrides.py b/hgext/largefiles/overrides.py
--- a/hgext/largefiles/overrides.py
+++ b/hgext/largefiles/overrides.py
@@ -1009,15 +1009,34 @@ def _getoutgoings(repo, missing, addfunc
 
 def outgoinghook(ui, repo, other, opts, missing):
     if opts.pop('large', None):
-        toupload = set()
-        lfutil.getlfilestoupload(repo, missing,
-                                 lambda fn, lfhash: toupload.add(fn))
+        lfhashes = set()
+        if ui.debugflag:
+            toupload = {}
+            def addfunc(fn, lfhash):
+                if fn not in toupload:
+                    toupload[fn] = []
+                toupload[fn].append(lfhash)
+                lfhashes.add(lfhash)
+            def showhashes(fn):
+                for lfhash in sorted(toupload[fn]):
+                    ui.debug('    %s\n' % (lfhash))
+        else:
+            toupload = set()
+            def addfunc(fn, lfhash):
+                toupload.add(fn)
+                lfhashes.add(lfhash)
+            def showhashes(fn):
+                pass
+        _getoutgoings(repo, missing, addfunc)
+
         if not toupload:
             ui.status(_('largefiles: no files to upload\n'))
         else:
-            ui.status(_('largefiles to upload:\n'))
+            ui.status(_('largefiles to upload (%d entities):\n')
+                      % (len(lfhashes)))
             for file in sorted(toupload):
                 ui.status(lfutil.splitstandin(file) + '\n')
+                showhashes(file)
             ui.status('\n')
 
 def summaryremotehook(ui, repo, opts, changes):
diff --git a/tests/test-largefiles-misc.t b/tests/test-largefiles-misc.t
--- a/tests/test-largefiles-misc.t
+++ b/tests/test-largefiles-misc.t
@@ -478,7 +478,7 @@ check messages when there are files to u
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     #1
   
-  largefiles to upload:
+  largefiles to upload (1 entities):
   b
   
   $ hg -R clone2 outgoing --large --graph --template "{rev}"
@@ -486,7 +486,7 @@ check messages when there are files to u
   searching for changes
   @  1
   
-  largefiles to upload:
+  largefiles to upload (1 entities):
   b
   
 
@@ -509,11 +509,28 @@ check messages when there are files to u
   searching for changes
   1:1acbe71ce432
   2:6095d0695d70
-  largefiles to upload:
+  largefiles to upload (1 entities):
   b
   b1
   b2
   
+  $ hg -R clone2 cat -r 1 clone2/.hglf/b
+  89e6c98d92887913cadf06b2adb97f26cde4849b
+  $ hg -R clone2 outgoing --large -T "{rev}:{node|short}\n" --debug
+  comparing with $TESTTMP/issue3651/src (glob)
+  query 1; heads
+  searching for changes
+  all remote heads known locally
+  1:1acbe71ce432
+  2:6095d0695d70
+  largefiles to upload (1 entities):
+  b
+      89e6c98d92887913cadf06b2adb97f26cde4849b
+  b1
+      89e6c98d92887913cadf06b2adb97f26cde4849b
+  b2
+      89e6c98d92887913cadf06b2adb97f26cde4849b
+  
 
   $ echo bbb > clone2/b
   $ hg -R clone2 commit -m '#3: add new largefile entity as existing file'
@@ -542,11 +559,35 @@ check messages when there are files to u
   3:7983dce246cc
   4:233f12ada4ae
   5:036794ea641c
-  largefiles to upload:
+  largefiles to upload (3 entities):
   b
   b1
   b2
   
+  $ hg -R clone2 cat -r 3 clone2/.hglf/b
+  c801c9cfe94400963fcb683246217d5db77f9a9a
+  $ hg -R clone2 cat -r 4 clone2/.hglf/b
+  13f9ed0898e315bf59dc2973fec52037b6f441a2
+  $ hg -R clone2 outgoing --large -T "{rev}:{node|short}\n" --debug
+  comparing with $TESTTMP/issue3651/src (glob)
+  query 1; heads
+  searching for changes
+  all remote heads known locally
+  1:1acbe71ce432
+  2:6095d0695d70
+  3:7983dce246cc
+  4:233f12ada4ae
+  5:036794ea641c
+  largefiles to upload (3 entities):
+  b
+      13f9ed0898e315bf59dc2973fec52037b6f441a2
+      89e6c98d92887913cadf06b2adb97f26cde4849b
+      c801c9cfe94400963fcb683246217d5db77f9a9a
+  b1
+      89e6c98d92887913cadf06b2adb97f26cde4849b
+  b2
+      89e6c98d92887913cadf06b2adb97f26cde4849b
+  
 
   $ cd ..
 
diff --git a/tests/test-largefiles.t b/tests/test-largefiles.t
--- a/tests/test-largefiles.t
+++ b/tests/test-largefiles.t
@@ -680,7 +680,7 @@ Test that outgoing --large works (with r
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     this used to not notice the rm
   
-  largefiles to upload:
+  largefiles to upload (2 entities):
   foo
   large
   large8