diff --git a/src/validation.cpp b/src/validation.cpp
index a9b5bcf4a..ae3985485 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -36,9 +36,9 @@
 #include <txmempool.h>
 #include <ui_interface.h>
 #include <undo.h>
-#include <util/system.h>
 #include <util/moneystr.h>
 #include <util/strencodings.h>
+#include <util/system.h>
 #include <validationinterface.h>
 #include <warnings.h>
 
@@ -1455,9 +1455,7 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
     return true;
 }
 
-namespace {
-
-bool UndoWriteToDisk(const CBlockUndo& blockundo, FlatFilePos& pos, const uint256& hashBlock, const CMessageHeader::MessageStartChars& messageStart)
+static bool UndoWriteToDisk(const CBlockUndo& blockundo, FlatFilePos& pos, const uint256& hashBlock, const CMessageHeader::MessageStartChars& messageStart)
 {
     // Open history file to append
     CAutoFile fileout(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION);
@@ -1484,7 +1482,7 @@ bool UndoWriteToDisk(const CBlockUndo& blockundo, FlatFilePos& pos, const uint25
     return true;
 }
 
-static bool UndoReadFromDisk(CBlockUndo& blockundo, const CBlockIndex *pindex)
+bool UndoReadFromDisk(CBlockUndo& blockundo, const CBlockIndex* pindex)
 {
     FlatFilePos pos = pindex->GetUndoPos();
     if (pos.IsNull()) {
@@ -1533,8 +1531,6 @@ static bool AbortNode(CValidationState& state, const std::string& strMessage, co
     return state.Error(strMessage);
 }
 
-} // namespace
-
 /**
  * Restore the UTXO in a Coin at a given COutPoint
  * @param undo The Coin to be restored.
diff --git a/src/validation.h b/src/validation.h
index 0acca013b..d84e3a0db 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -21,6 +21,7 @@
 #include <versionbits.h>
 
 #include <algorithm>
+#include <atomic>
 #include <exception>
 #include <map>
 #include <memory>
@@ -30,10 +31,9 @@
 #include <utility>
 #include <vector>
 
-#include <atomic>
-
 class CBlockIndex;
 class CBlockTreeDB;
+class CBlockUndo;
 class CChainParams;
 class CCoinsViewDB;
 class CInv;
@@ -391,6 +391,8 @@ bool ReadBlockFromDisk(CBlock& block, const CBlockIndex* pindex, const Consensus
 bool ReadRawBlockFromDisk(std::vector<uint8_t>& block, const FlatFilePos& pos, const CMessageHeader::MessageStartChars& message_start);
 bool ReadRawBlockFromDisk(std::vector<uint8_t>& block, const CBlockIndex* pindex, const CMessageHeader::MessageStartChars& message_start);
 
+bool UndoReadFromDisk(CBlockUndo& blockundo, const CBlockIndex* pindex);
+
 /** Functions for validating blocks and updating the block tree */
 
 /** Context-independent validity checks */