diff --git a/libethereum/ExtVM.h b/libethereum/ExtVM.h
index 40ff62175..2ff270de5 100644
--- a/libethereum/ExtVM.h
+++ b/libethereum/ExtVM.h
@@ -70,7 +70,7 @@ public:
 	virtual u256 txCount(Address _a) override final { return m_s.transactionsFrom(_a); }
 
 	/// Does the account exist?
-	virtual bool exists(Address _a) { return m_s.addressInUse(_a); }
+	virtual bool exists(Address _a) override final { return m_s.addressInUse(_a); }
 
 	/// Suicide the associated contract to the given address.
 	virtual void suicide(Address _a) override final