diff --git a/test/av1_inv_txfm1d_test.cc b/test/av1_inv_txfm1d_test.cc
index 9df95066b63c617341eb2c76cb777515935b1d21..a2919a59863d883aa0e933c55bdcd83dc6d0ea16 100644
--- a/test/av1_inv_txfm1d_test.cc
+++ b/test/av1_inv_txfm1d_test.cc
@@ -42,7 +42,7 @@ const TxfmFunc inv_txfm_func_ls[][2] = {
 };
 
 // the maximum stage number of fwd/inv 1d dct/adst txfm is 12
-const int8_t cos_bit[12] = { 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14 };
+const int8_t cos_bit[12] = { 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13 };
 const int8_t range_bit[12] = { 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32 };
 
 TEST(av1_inv_txfm1d, round_trip) {