diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -1503,7 +1503,7 @@ class revlog(object):
                 bin = "".join(p)
         else:
             bin = _compress(text)
-        if bin is None or len(bin) > l:
+        if bin is None or len(bin) >= l:
             if text[0] == '\0':
                 return ("", text)
             return ('u', text)
diff --git a/tests/test-bundle.t b/tests/test-bundle.t
--- a/tests/test-bundle.t
+++ b/tests/test-bundle.t
@@ -268,13 +268,13 @@ Cannot produce streaming clone bundles w
 packed1 is produced properly
 
   $ hg -R test debugcreatestreamclonebundle packed.hg
-  writing 2663 bytes for 6 files
+  writing 2664 bytes for 6 files
   bundle requirements: generaldelta, revlogv1
 
   $ f -B 64 --size --sha1 --hexdump packed.hg
-  packed.hg: size=2826, sha1=e139f97692a142b19cdcff64a69697d5307ce6d4
+  packed.hg: size=2827, sha1=9d14cb90c66a21462d915ab33656f38b9deed686
   0000: 48 47 53 31 55 4e 00 00 00 00 00 00 00 06 00 00 |HGS1UN..........|
-  0010: 00 00 00 00 0a 67 00 16 67 65 6e 65 72 61 6c 64 |.....g..generald|
+  0010: 00 00 00 00 0a 68 00 16 67 65 6e 65 72 61 6c 64 |.....h..generald|
   0020: 65 6c 74 61 2c 72 65 76 6c 6f 67 76 31 00 64 61 |elta,revlogv1.da|
   0030: 74 61 2f 61 64 69 66 66 65 72 65 6e 74 66 69 6c |ta/adifferentfil|
 
diff --git a/tests/test-commit-amend.t b/tests/test-commit-amend.t
--- a/tests/test-commit-amend.t
+++ b/tests/test-commit-amend.t
@@ -1147,7 +1147,7 @@ directory)
   R olddirname/newfile.py
   $ hg debugindex newdirname/newfile.py
      rev    offset  length  delta linkrev nodeid       p1           p2
-       0         0      88     -1       3 34a4d536c0c0 000000000000 000000000000
+       0         0      89     -1       3 34a4d536c0c0 000000000000 000000000000
 
   $ echo a >> newdirname/commonfile.py
   $ hg ci --amend -m bug
@@ -1155,7 +1155,7 @@ directory)
   newdirname/newfile.py renamed from olddirname/newfile.py:690b295714aed510803d3020da9c70fca8336def (glob)
   $ hg debugindex newdirname/newfile.py
      rev    offset  length  delta linkrev nodeid       p1           p2
-       0         0      88     -1       3 34a4d536c0c0 000000000000 000000000000
+       0         0      89     -1       3 34a4d536c0c0 000000000000 000000000000
 
 #if execbit