1 files changed, 5 insertions, 1 deletions
diff --git a/src/chain.h b/src/chain.h
index fc89599bd1..2eb780d499 100644
--- a/src/chain.h
+++ b/src/chain.h
@@ -320,7 +320,11 @@ public:
 
     //! @returns true if the block is assumed-valid; this means it is queued to be
     //!   validated by a background chainstate.
-    bool IsAssumedValid() const { return nStatus & BLOCK_ASSUMED_VALID; }
+    bool IsAssumedValid() const EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
+    {
+        AssertLockHeld(::cs_main);
+        return nStatus & BLOCK_ASSUMED_VALID;
+    }
 
     //! Raise the validity level of this block index entry.
     //! Returns true if the validity was changed.