diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -46,7 +46,7 @@
 #include <mutex>
 
 struct CUpdatedBlock {
-    uint256 hash;
+    BlockHash hash;
     int height;
 };