diff --git a/ethstore.go b/ethstore.go
index 1d9adad..38708dc 100644
--- a/ethstore.go
+++ b/ethstore.go
@@ -643,8 +643,8 @@ func batchRequestReceipts(ctx context.Context, elClient *gethRPC.Client, txHashe
 
 func requestReceipts(ctx context.Context, elClient *gethRPC.Client, blockNumber uint64) ([]*TxReceipt, error) {
 	txReceipts := make([]*TxReceipt, 0)
-
-	ioErr := elClient.CallContext(ctx, &txReceipts, "eth_getBlockReceipts", blockNumber)
+	blockNumberHex := fmt.Sprintf("0x%x", blockNumber)
+	ioErr := elClient.CallContext(ctx, &txReceipts, "eth_getBlockReceipts", blockNumberHex)
 	if ioErr != nil {
 		return nil, fmt.Errorf("io-error when fetching tx-receipts: %w", ioErr)
 	}