--- a/mercurial/patch.py	Thu Jan 22 22:42:35 2015 -0800
+++ b/mercurial/patch.py	Fri Feb 06 15:21:56 2015 -0800
@@ -1776,7 +1776,6 @@
         flag2 = None
         content1 = None
         content2 = None
-        binary = False
         copyop = None
         if f not in addedset:
             content1 = getfilectx(f, ctx1).data()
@@ -1810,6 +1809,8 @@
                 flag1 = ctx1.flags(f)
                 flag2 = ctx2.flags(f)
 
+        binary = False
+        if opts.git or losedatafn:
             binary = util.binary(content1) or util.binary(content2)
 
         if losedatafn and not opts.git: