diff --git a/src/validation.cpp b/src/validation.cpp
index 3726cb3b14..0f348ab484 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -142,7 +142,7 @@ private:
       * ahead and mark descendants of invalid blocks as FAILED_CHILD at that time,
       * instead of putting things in this set.
       */
-    std::set<CBlockIndex*> g_failed_blocks;
+    std::set<CBlockIndex*> m_failed_blocks;
 
 public:
     CChain chainActive;
@@ -1286,7 +1286,7 @@ void static InvalidChainFound(CBlockIndex* pindexNew)
 void CChainState::InvalidBlockFound(CBlockIndex *pindex, const CValidationState &state) {
     if (!state.CorruptionPossible()) {
         pindex->nStatus |= BLOCK_FAILED_VALID;
-        g_failed_blocks.insert(pindex);
+        m_failed_blocks.insert(pindex);
         setDirtyBlockIndex.insert(pindex);
         setBlockIndexCandidates.erase(pindex);
         InvalidChainFound(pindex);
@@ -2783,7 +2783,7 @@ bool CChainState::InvalidateBlock(CValidationState& state, const CChainParams& c
     pindex->nStatus |= BLOCK_FAILED_VALID;
     setDirtyBlockIndex.insert(pindex);
     setBlockIndexCandidates.erase(pindex);
-    g_failed_blocks.insert(pindex);
+    m_failed_blocks.insert(pindex);
 
     // DisconnectTip will add transactions to disconnectpool; try to add these
     // back to the mempool.
@@ -2829,7 +2829,7 @@ bool CChainState::ResetBlockFailureFlags(CBlockIndex *pindex) {
                 // Reset invalid block marker if it was pointing to one of those.
                 pindexBestInvalid = nullptr;
             }
-            g_failed_blocks.erase(it->second);
+            m_failed_blocks.erase(it->second);
         }
         it++;
     }
@@ -3323,7 +3323,7 @@ bool CChainState::AcceptBlockHeader(const CBlockHeader& block, CValidationState&
             return error("%s: Consensus::ContextualCheckBlockHeader: %s, %s", __func__, hash.ToString(), FormatStateMessage(state));
 
         if (!pindexPrev->IsValid(BLOCK_VALID_SCRIPTS)) {
-            for (const CBlockIndex* failedit : g_failed_blocks) {
+            for (const CBlockIndex* failedit : m_failed_blocks) {
                 if (pindexPrev->GetAncestor(failedit->nHeight) == failedit) {
                     assert(failedit->nStatus & BLOCK_FAILED_VALID);
                     CBlockIndex* invalid_walk = pindexPrev;
@@ -4189,7 +4189,7 @@ bool RewindBlockIndex(const CChainParams& params) {
 
 void CChainState::UnloadBlockIndex() {
     nBlockSequenceId = 1;
-    g_failed_blocks.clear();
+    m_failed_blocks.clear();
     setBlockIndexCandidates.clear();
 }