diff --git a/src/server/db_slice.cc b/src/server/db_slice.cc
index 31786dd4abc9..f4bb779d813a 100644
--- a/src/server/db_slice.cc
+++ b/src/server/db_slice.cc
@@ -294,7 +294,8 @@ pair<PrimeIterator, ExpireIterator> DbSlice::FindExt(DbIndex db_ind, string_view
         }
       };
 
-      db.prime.CVCUponBump(change_cb_.front().first, res.first, bump_cb);
+      //
+      db.prime.CVCUponBump(change_cb_.back().first, res.first, bump_cb);
     }
 
     res.first = db.prime.BumpUp(res.first, PrimeBumpPolicy{});
diff --git a/src/server/db_slice.h b/src/server/db_slice.h
index ccab1c6b1cce..10587d7b1f54 100644
--- a/src/server/db_slice.h
+++ b/src/server/db_slice.h
@@ -289,6 +289,7 @@ class DbSlice {
   // Used in temporary computations in Acquire/Release.
   absl::flat_hash_set<std::string_view> uniq_keys_;
 
+  // ordered from the smallest to largest version.
   std::vector<std::pair<uint64_t, ChangeCallback>> change_cb_;
 };