diff --git a/lib_dec/FEC_HQ_phase_ecu_fx.c b/lib_dec/FEC_HQ_phase_ecu_fx.c
index b8c16474e7027ede6c9a783aba95a5f76e70e048..ef09c3de3272be34c95156d3f9d7d17033284ec2 100644
--- a/lib_dec/FEC_HQ_phase_ecu_fx.c
+++ b/lib_dec/FEC_HQ_phase_ecu_fx.c
@@ -4565,13 +4565,13 @@ static void ivas_fec_noise_filling_fx(
     pt6 = &p_mdct_ola[0];
     FOR( k = 0; k < tmp_fx; k++ )
     {
-        L_tmp = L_mult( *sinq_tab, *sinq_tab ); /*Q30 */
+        L_tmp = L_mult( *sinq_tab, *sinq_tab ); /*Q31 */
         sinq_tab++;
-        q2 = round_fx( L_sub( 2147483647, L_tmp ) );                                          /*Q15 */
-        q1 = round_fx( L_tmp );                                                               /*Q15 */
-        L_tmp = L_mult( ( *pt1 ), q1 );                                                       /*Qsynth+16 */
-        L_tmp = L_add( L_tmp, L_shr( Mpy_32_16_1( L_deposit_h( *pt6++ ), q2 ), Q_old_out ) ); /*Qsynth+16 */
-        ( *pt1++ ) = round_fx( L_tmp );                                                       /*Qsynth */
+        q2 = round_fx( L_sub( 2147483647, L_tmp ) );                                                  /*Q15 */
+        q1 = round_fx( L_tmp );                                                                       /*Q15 */
+        L_tmp = L_mult( ( *pt1 ), q1 );                                                               /*Qsynth+16 */
+        L_tmp = L_add_sat( L_tmp, L_shr_sat( Mpy_32_16_1( L_deposit_h( *pt6++ ), q2 ), Q_old_out ) ); /*Qsynth+16 */
+        ( *pt1++ ) = round_fx_sat( L_tmp );                                                           /*Qsynth */
         move16();
     }