@@ 21,16 21,23 @@ from __future__ import absolute_import
 
 from mercurial import (
     encoding,
-    util,
 )
 
+try:
+    from mercurial.utils import stringutil
+    _binarydata = stringutil.binary
+except (AttributeError, ImportError):
+    # hg<4.6
+    from mercurial import util
+    _binarydata = util.binary
+
 def _binaryenc(enc):
     enc = enc.lower().translate(None, '_-')
     return enc.startswith(('utf16', 'utf32', 'u16', 'u32'))
 
 def filterencoding(ui, fctx, data):
     dataencs = ui.configlist('textful', 'encoding', [])
-    if not any(_binaryenc(e) for e in dataencs) and util.binary(data):
+    if not any(_binaryenc(e) for e in dataencs) and _binarydata(data):
         return data
 
     for enc in dataencs: