diff --git a/src/node/blockstorage.cpp b/src/node/blockstorage.cpp
index 29b624cb12..338452c23f 100644
--- a/src/node/blockstorage.cpp
+++ b/src/node/blockstorage.cpp
@@ -818,13 +818,13 @@ void BlockManager::UnlinkPrunedFiles(const std::set<int>& setFilesToPrune) const
 
 AutoFile BlockManager::OpenBlockFile(const FlatFilePos& pos, bool fReadOnly) const
 {
-    return AutoFile{m_block_file_seq.Open(pos, fReadOnly)};
+    return AutoFile{m_block_file_seq.Open(pos, fReadOnly), m_xor_key};
 }
 
 /** Open an undo file (rev?????.dat) */
 AutoFile BlockManager::OpenUndoFile(const FlatFilePos& pos, bool fReadOnly) const
 {
-    return AutoFile{m_undo_file_seq.Open(pos, fReadOnly)};
+    return AutoFile{m_undo_file_seq.Open(pos, fReadOnly), m_xor_key};
 }
 
 fs::path BlockManager::GetBlockPosFilename(const FlatFilePos& pos) const
@@ -1144,6 +1144,14 @@ FlatFilePos BlockManager::SaveBlockToDisk(const CBlock& block, int nHeight)
     return blockPos;
 }
 
+BlockManager::BlockManager(const util::SignalInterrupt& interrupt, Options opts)
+    : m_prune_mode{opts.prune_target > 0},
+      m_xor_key{},
+      m_opts{std::move(opts)},
+      m_block_file_seq{FlatFileSeq{m_opts.blocks_dir, "blk", m_opts.fast_prune ? 0x4000 /* 16kB */ : BLOCKFILE_CHUNK_SIZE}},
+      m_undo_file_seq{FlatFileSeq{m_opts.blocks_dir, "rev", UNDOFILE_CHUNK_SIZE}},
+      m_interrupt{interrupt} {}
+
 class ImportingNow
 {
     std::atomic<bool>& m_importing;
diff --git a/src/node/blockstorage.h b/src/node/blockstorage.h
index 8c6190cd02..821bbf5109 100644
--- a/src/node/blockstorage.h
+++ b/src/node/blockstorage.h
@@ -240,6 +240,8 @@ private:
 
     const bool m_prune_mode;
 
+    const std::vector<std::byte> m_xor_key;
+
     /** Dirty block index entries. */
     std::set<CBlockIndex*> m_dirty_blockindex;
 
@@ -264,12 +266,7 @@ private:
 public:
     using Options = kernel::BlockManagerOpts;
 
-    explicit BlockManager(const util::SignalInterrupt& interrupt, Options opts)
-        : m_prune_mode{opts.prune_target > 0},
-          m_opts{std::move(opts)},
-          m_block_file_seq{FlatFileSeq{m_opts.blocks_dir, "blk", m_opts.fast_prune ? 0x4000 /* 16kB */ : BLOCKFILE_CHUNK_SIZE}},
-          m_undo_file_seq{FlatFileSeq{m_opts.blocks_dir, "rev", UNDOFILE_CHUNK_SIZE}},
-          m_interrupt{interrupt} {}
+    explicit BlockManager(const util::SignalInterrupt& interrupt, Options opts);
 
     const util::SignalInterrupt& m_interrupt;
     std::atomic<bool> m_importing{false};