diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -2331,7 +2331,16 @@
 
         curr = len(self)
         prev = curr - 1
-        offset = self.end(prev)
+
+        if self.version & 0xFFFF == REVLOGV2:
+            prev_node = self.index[prev]
+            sidedata_offset = prev_node[8]
+            if sidedata_offset == 0:
+                offset = self.end(prev)
+            else:
+                offset = sidedata_offset + prev_node[9]
+        else:
+            offset = self.end(prev)
 
         if self._concurrencychecker:
             if self._inline: