diff --git a/src/node/blockstorage.cpp b/src/node/blockstorage.cpp
index 07878a5602..3ee6b5d210 100644
--- a/src/node/blockstorage.cpp
+++ b/src/node/blockstorage.cpp
@@ -669,33 +669,6 @@ CBlockFileInfo* BlockManager::GetBlockFileInfo(size_t n)
     return &m_blockfile_info.at(n);
 }
 
-bool BlockManager::UndoWriteToDisk(const CBlockUndo& blockundo, FlatFilePos& pos, const uint256& hashBlock) const
-{
-    // Open history file to append
-    AutoFile fileout{OpenUndoFile(pos)};
-    if (fileout.IsNull()) {
-        LogError("%s: OpenUndoFile failed\n", __func__);
-        return false;
-    }
-
-    // Write index header
-    unsigned int nSize = GetSerializeSize(blockundo);
-    fileout << GetParams().MessageStart() << nSize;
-
-    // Write undo data
-    long fileOutPos = fileout.tell();
-    pos.nPos = (unsigned int)fileOutPos;
-    fileout << blockundo;
-
-    // calculate & write checksum
-    HashWriter hasher{};
-    hasher << hashBlock;
-    hasher << blockundo;
-    fileout << hasher.GetHash();
-
-    return true;
-}
-
 bool BlockManager::UndoReadFromDisk(CBlockUndo& blockundo, const CBlockIndex& index) const
 {
     const FlatFilePos pos{WITH_LOCK(::cs_main, return index.GetUndoPos())};
@@ -992,33 +965,52 @@ bool BlockManager::WriteUndoDataForBlock(const CBlockUndo& blockundo, BlockValid
 
     // Write undo information to disk
     if (block.GetUndoPos().IsNull()) {
-        FlatFilePos _pos;
-        if (!FindUndoPos(state, block.nFile, _pos, ::GetSerializeSize(blockundo) + 40)) {
+        FlatFilePos pos;
+        if (!FindUndoPos(state, block.nFile, pos, ::GetSerializeSize(blockundo) + 40)) {
             LogError("%s: FindUndoPos failed\n", __func__);
             return false;
         }
-        if (!UndoWriteToDisk(blockundo, _pos, block.pprev->GetBlockHash())) {
+        // Open history file to append
+        AutoFile fileout{OpenUndoFile(pos)};
+        if (fileout.IsNull()) {
+            LogError("%s: OpenUndoFile failed\n", __func__);
             return FatalError(m_opts.notifications, state, _("Failed to write undo data."));
         }
+
+        // Write index header
+        unsigned int nSize = GetSerializeSize(blockundo);
+        fileout << GetParams().MessageStart() << nSize;
+
+        // Write undo data
+        long fileOutPos = fileout.tell();
+        pos.nPos = (unsigned int)fileOutPos;
+        fileout << blockundo;
+
+        // Calculate & write checksum
+        HashWriter hasher{};
+        hasher << block.pprev->GetBlockHash();
+        hasher << blockundo;
+        fileout << hasher.GetHash();
+
         // rev files are written in block height order, whereas blk files are written as blocks come in (often out of order)
         // we want to flush the rev (undo) file once we've written the last block, which is indicated by the last height
         // in the block file info as below; note that this does not catch the case where the undo writes are keeping up
         // with the block writes (usually when a synced up node is getting newly mined blocks) -- this case is caught in
         // the FindNextBlockPos function
-        if (_pos.nFile < cursor.file_num && static_cast<uint32_t>(block.nHeight) == m_blockfile_info[_pos.nFile].nHeightLast) {
+        if (pos.nFile < cursor.file_num && static_cast<uint32_t>(block.nHeight) == m_blockfile_info[pos.nFile].nHeightLast) {
             // Do not propagate the return code, a failed flush here should not
             // be an indication for a failed write. If it were propagated here,
             // the caller would assume the undo data not to be written, when in
             // fact it is. Note though, that a failed flush might leave the data
             // file untrimmed.
-            if (!FlushUndoFile(_pos.nFile, true)) {
-                LogPrintLevel(BCLog::BLOCKSTORAGE, BCLog::Level::Warning, "Failed to flush undo file %05i\n", _pos.nFile);
+            if (!FlushUndoFile(pos.nFile, true)) {
+                LogPrintLevel(BCLog::BLOCKSTORAGE, BCLog::Level::Warning, "Failed to flush undo file %05i\n", pos.nFile);
             }
-        } else if (_pos.nFile == cursor.file_num && block.nHeight > cursor.undo_height) {
+        } else if (pos.nFile == cursor.file_num && block.nHeight > cursor.undo_height) {
             cursor.undo_height = block.nHeight;
         }
         // update nUndoPos in block index
-        block.nUndoPos = _pos.nPos;
+        block.nUndoPos = pos.nPos;
         block.nStatus |= BLOCK_HAVE_UNDO;
         m_dirty_blockindex.insert(&block);
     }
diff --git a/src/node/blockstorage.h b/src/node/blockstorage.h
index ac6db0558d..339282227c 100644
--- a/src/node/blockstorage.h
+++ b/src/node/blockstorage.h
@@ -176,7 +176,6 @@ private:
      * (BLOCK_SERIALIZATION_HEADER_SIZE)
      */
     bool WriteBlockToDisk(const CBlock& block, FlatFilePos& pos) const;
-    bool UndoWriteToDisk(const CBlockUndo& blockundo, FlatFilePos& pos, const uint256& hashBlock) const;
 
     /* Calculate the block/rev files to delete based on height specified by user with RPC command pruneblockchain */
     void FindFilesToPruneManual(