diff --git a/lib_com/ivas_prot_fx.h b/lib_com/ivas_prot_fx.h
index 97c0a37dcfc3964c12d797612ea2db356fb19daf..5ad13d3a490117c48601417218f8e8b199c541bb 100644
--- a/lib_com/ivas_prot_fx.h
+++ b/lib_com/ivas_prot_fx.h
@@ -163,7 +163,8 @@ void sns_compute_scf_fx(
     Word32 spectrum[],
     const PsychoacousticParameters *pPsychParams,
     const Word16 L_frame,
-    Word32 *scf );
+    Word32 *scf,
+    Word16 q);
 
 void sns_interpolate_scalefactors_fx(
     Word32 *scf_int,    /* o  : interpolated scalefactors for spectrum shaping                         */
diff --git a/lib_com/ivas_sns_com_fx.c b/lib_com/ivas_sns_com_fx.c
index a059cc6f7b2dffee4b83110db59e7e7e289a730d..57c621abc1e5feec0cccb448bb13633d98830722 100644
--- a/lib_com/ivas_sns_com_fx.c
+++ b/lib_com/ivas_sns_com_fx.c
@@ -54,7 +54,8 @@ void sns_compute_scf_fx(
     Word32 spectrum[],
     const PsychoacousticParameters *pPsychParams,
     const Word16 L_frame,
-    Word32 *scf )
+    Word32 *scf,
+    Word16 q)
 {
     Word16 i, n, k;
     Word32 x[FDNS_NPTS], xs[FDNS_NPTS], mean, xl4[SNS_NPTS], nf, xl[FDNS_NPTS];
@@ -163,7 +164,7 @@ void sns_compute_scf_fx(
     {
         Word16 e_tmp = norm_l( xs[i] );
         Word16 f_tmp = Log2_norm_lc( L_shl( xs[i], e_tmp ) );
-        e_tmp = sub( sub( 30, e_tmp ), 12 );
+        e_tmp = sub( sub( 30, e_tmp ), q );
         /* Note: Mpy_32_16 is used temporarily for this computation, It needs to be replaced with appropriate BASOP. */
         xl[i] = Mpy_32_16( e_tmp, f_tmp, 16384 ); /* Q16 */
     }
@@ -204,7 +205,7 @@ void sns_compute_scf_fx(
     /* Remove mean and scaling */
     sum = 0;
     for (Word16 ind = 0; ind < SNS_NPTS; ind++) {
-        sum += (Word64)xl4[i];
+        sum += (Word64)xl4[ind];
     }
     mean = (Word32)(sum >> 4);
 
diff --git a/lib_dec/tonalMDCTconcealment.c b/lib_dec/tonalMDCTconcealment.c
index 51c1afd4eaed27d0908bf03a10bd95e1f6ee8991..649fae812e97ebc8e70d4c62a3e0499fbfceefab 100644
--- a/lib_dec/tonalMDCTconcealment.c
+++ b/lib_dec/tonalMDCTconcealment.c
@@ -1221,7 +1221,7 @@ void TonalMdctConceal_whiten_noise_shape_ivas(
             if(abs((Word32)whitenend_noise_shape[k])!=0) q = s_min(q, norm_l( whitenend_noise_shape[k] ));
         }
 
-        q -= find_guarded_bits_fx(L_frame) + 2;
+        q -= find_guarded_bits_fx(L_frame) - 2;
         //q -= 1;
 
         FOR( Word16 k = 0; k < L_FRAME16k; k++ )
@@ -1229,7 +1229,7 @@ void TonalMdctConceal_whiten_noise_shape_ivas(
             whitenend_noise_shape_fx[k] = q>=0 ? ((Word32) ( whitenend_noise_shape[k] *(1<< q) )):((Word32) ( whitenend_noise_shape[k] / (1<< q) ));
         }
 
-        sns_compute_scf_fx( whitenend_noise_shape_fx, psychParams, L_frame, scf_fx );
+        sns_compute_scf_fx( whitenend_noise_shape_fx, psychParams, L_frame, scf_fx, q );
 
         sns_interpolate_scalefactors_fx( scfs_int_fx, scf_fx, ENC );
         sns_interpolate_scalefactors_fx( scfs_bg_fx, scf_fx, DEC );