diff --git a/hgext/keyword.py b/hgext/keyword.py
index f6369544bf851fc367db7efb1676f0cc249fa89b_aGdleHQva2V5d29yZC5weQ==..eac5c1737f794d65c0673bf28e0d73e8cfe8c417_aGdleHQva2V5d29yZC5weQ== 100644
--- a/hgext/keyword.py
+++ b/hgext/keyword.py
@@ -737,6 +737,8 @@
             return ret
 
     def kwfilectx_cmp(orig, self, fctx):
+        if fctx._customcmp:
+            return fctx.cmp(self)
         # keyword affects data size, comparing wdir and filelog size does
         # not make sense
         if (fctx._filenode is None and