diff --git a/utilities/transactions/write_unprepared_txn.h b/utilities/transactions/write_unprepared_txn.h
index 4a00406d7..68567eb6e 100644
--- a/utilities/transactions/write_unprepared_txn.h
+++ b/utilities/transactions/write_unprepared_txn.h
@@ -42,14 +42,15 @@ class WriteUnpreparedTxnReadCallback : public ReadCallback {
 
   // TODO(myabandeh): override Refresh when Iterator::Refresh is supported
  private:
-  SequenceNumber CalcMaxVisibleSeq(WriteUnpreparedTxn* txn,
-                                   SequenceNumber snapshot_seq) {
+  static SequenceNumber CalcMaxVisibleSeq(WriteUnpreparedTxn* txn,
+                                          SequenceNumber snapshot_seq) {
     SequenceNumber max_unprepared = CalcMaxUnpreparedSequenceNumber(txn);
     assert(snapshot_seq < max_unprepared || max_unprepared == 0 ||
            snapshot_seq == kMaxSequenceNumber);
     return std::max(max_unprepared, snapshot_seq);
   }
-  SequenceNumber CalcMaxUnpreparedSequenceNumber(WriteUnpreparedTxn* txn);
+  static SequenceNumber CalcMaxUnpreparedSequenceNumber(
+      WriteUnpreparedTxn* txn);
   WritePreparedTxnDB* db_;
   WriteUnpreparedTxn* txn_;
   SequenceNumber wup_snapshot_;