diff --git a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineGetPayloadBodiesByHashV1.java b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineGetPayloadBodiesByHashV1.java
index 77c0521a325..12411b1d2d6 100644
--- a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineGetPayloadBodiesByHashV1.java
+++ b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineGetPayloadBodiesByHashV1.java
@@ -58,7 +58,8 @@ public JsonRpcResponse syncResponse(final JsonRpcRequestContext request) {
 
     final List<Hash> blockHashes =
         Arrays.stream(request.getRequest().getParams())
-            .map(Hash.class::cast)
+            .map(String::valueOf)
+            .map(Hash::fromHexString)
             .collect(Collectors.toList());
 
     traceLambda(LOG, "{} parameters: blockHashes {}", () -> getName(), () -> blockHashes);