diff --git a/ethers/provider.nim b/ethers/provider.nim
index eb09474..dfc7778 100644
--- a/ethers/provider.nim
+++ b/ethers/provider.nim
@@ -46,7 +46,7 @@ type
   Block* = object
     number*: ?UInt256
     timestamp*: UInt256
-    hash*: ?array[32, byte]
+    hash*: ?BlockHash
 
 const EthersDefaultConfirmations* {.intdefine.} = 12
 const EthersReceiptTimeoutBlks* {.intdefine.} = 50 # in blocks