diff --git a/src/main.cpp b/src/main.cpp
index 40c713ce9..7b9ca2878 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2875,6 +2875,7 @@ bool static LoadBlockIndexDB()
 
 bool VerifyDB(int nCheckLevel, int nCheckDepth)
 {
+    LOCK(cs_main);
     if (chainActive.Tip() == NULL || chainActive.Tip()->pprev == NULL)
         return true;