diff --git a/src/evo/specialtxman.cpp b/src/evo/specialtxman.cpp
index 1b807d751b4ebf..ac8965095643c4 100644
--- a/src/evo/specialtxman.cpp
+++ b/src/evo/specialtxman.cpp
@@ -57,6 +57,8 @@ bool CheckSpecialTx(const CTransaction& tx, const CBlockIndex* pindexPrev, const
 static bool ProcessSpecialTx(const CTransaction& tx, const CBlockIndex* pindex, CMNHFManager& mnhfManager, TxValidationState& state)
 
 {
+    AssertLockHeld(cs_main);
+
     if (tx.nVersion != 3 || tx.nType == TRANSACTION_NORMAL) {
         return true;
     }
@@ -81,6 +83,8 @@ static bool ProcessSpecialTx(const CTransaction& tx, const CBlockIndex* pindex,
 
 static bool UndoSpecialTx(const CTransaction& tx, const CBlockIndex* pindex, CMNHFManager& mnhfManager)
 {
+    AssertLockHeld(cs_main);
+
     if (tx.nVersion != 3 || tx.nType == TRANSACTION_NORMAL) {
         return true;
     }