diff --git a/block_test.go b/block_test.go
index bb6b748..4ad8f89 100644
--- a/block_test.go
+++ b/block_test.go
@@ -270,7 +270,7 @@ func TestBlockErrors(t *testing.T) {
 		t.Errorf("TxHash: wrong error - got: %v <%T>, "+
 			"want: <%T>", err, err, btcutil.OutOfRangeError(""))
 	}
-	_, err = b.TxHash(len(Block100000.Transactions) + 1)
+	_, err = b.TxHash(len(Block100000.Transactions))
 	if _, ok := err.(btcutil.OutOfRangeError); !ok {
 		t.Errorf("TxHash: wrong error - got: %v <%T>, "+
 			"want: <%T>", err, err, btcutil.OutOfRangeError(""))
@@ -282,7 +282,7 @@ func TestBlockErrors(t *testing.T) {
 		t.Errorf("Tx: wrong error - got: %v <%T>, "+
 			"want: <%T>", err, err, btcutil.OutOfRangeError(""))
 	}
-	_, err = b.Tx(len(Block100000.Transactions) + 1)
+	_, err = b.Tx(len(Block100000.Transactions))
 	if _, ok := err.(btcutil.OutOfRangeError); !ok {
 		t.Errorf("Tx: wrong error - got: %v <%T>, "+
 			"want: <%T>", err, err, btcutil.OutOfRangeError(""))