diff --git a/src/test/test_dash.cpp b/src/test/test_dash.cpp
index c494bcb3e3..f5b6ea2924 100644
--- a/src/test/test_dash.cpp
+++ b/src/test/test_dash.cpp
@@ -204,7 +204,10 @@ CBlock TestChainSetup::CreateBlock(const std::vector<CMutableTransaction>& txns,
 
     // IncrementExtraNonce creates a valid coinbase and merkleRoot
     unsigned int extraNonce = 0;
-    IncrementExtraNonce(&block, chainActive.Tip(), extraNonce);
+    {
+        LOCK(cs_main);
+        IncrementExtraNonce(&block, chainActive.Tip(), extraNonce);
+    }
 
     while (!CheckProofOfWork(block.GetHash(), block.nBits, chainparams.GetConsensus())) ++block.nNonce;