diff --git a/contrib/phabricator.py b/contrib/phabricator.py
--- a/contrib/phabricator.py
+++ b/contrib/phabricator.py
@@ -274,7 +274,7 @@
     """
     repo = ctx.repo()
     if oldnode:
-        diffopts = mdiff.diffopts(git=True, context=1)
+        diffopts = mdiff.diffopts(git=True, context=32767)
         oldctx = repo.unfiltered()[oldnode]
         neednewdiff = (getdiff(ctx, diffopts) != getdiff(oldctx, diffopts))
     else: