diff --git a/lib_com/swb_tbe_com_fx.c b/lib_com/swb_tbe_com_fx.c
index e4d84ef23c38a6584b694485cb3082d43667ff37..2cb51ae93dd6279229e166e17b066b2962e2bee3 100644
--- a/lib_com/swb_tbe_com_fx.c
+++ b/lib_com/swb_tbe_com_fx.c
@@ -6982,6 +6982,7 @@ void synthesise_fb_high_band_fx(
         elliptic_bpf_48k_generic_fx( excitation_in_interp3, &exp_tmp, tmp, bpf_memory, bpf_memory_Q, full_band_bpf_1_fx );
 #endif
     }
+    /* temp1 = sum2_f( tmp, L_FRAME48k ) + 0.001f */
     temp1 = sum2_fx_mod( tmp, L_FRAME48k );
 
     L_tmp = L_max( 1, fb_exc_energy ); /*Q(2*Q_fb_exc + 1)*/
@@ -6990,9 +6991,33 @@ void synthesise_fb_high_band_fx(
     tmp1 = sub( add( Q_fb_exc, Q_fb_exc ), 8 ); /* 1-9*/
     exp = sub( sub( 31, tmp1 ), exp );
 
-    exp2 = norm_l( temp1 );
-    tmp2 = extract_h( L_shl( temp1, exp2 ) );
-    exp2 = sub( sub( 31, sub( shl( exp_tmp, 1 ), 8 ) ), exp2 ); /* in Q15 (temp1 in Q9)*/
+    IF( element_mode != EVS_MONO )
+    {
+        Word16 sft, t_Q;
+        Word64 P_ONE = 33; /* 0.001f in Q15 */
+        move64();
+        Word64 W_temp;
+
+        t_Q = sub( shl( exp_tmp, 1 ), 8 );
+        P_ONE = W_shl( P_ONE, sub( t_Q, 15 ) );
+
+        W_temp = W_add( P_ONE, temp1 );
+
+        sft = W_norm( W_temp );
+        W_temp = W_shl( W_temp, sft );
+
+        temp1 = W_extract_h( W_temp );
+        t_Q = sub( add( t_Q, sft ), 32 );
+
+        tmp2 = extract_h( temp1 );
+        exp2 = sub( 31, t_Q );
+    }
+    ELSE
+    {
+        exp2 = norm_l( temp1 );
+        tmp2 = extract_h( L_shl( temp1, exp2 ) );
+        exp2 = sub( sub( 31, sub( shl( exp_tmp, 1 ), 8 ) ), exp2 ); /* in Q15 (temp1 in Q9)*/
+    }
 
     exp = sub( exp2, exp ); /* Denormalize and substract */
     IF( GT_16( tmp2, tmp3 ) )