diff --git a/lib_com/gs_preech_fx.c b/lib_com/gs_preech_fx.c
index 3b3eaa7776b9ff3c7403e4cb7f30decf8bf77a2b..48ec22a22dd6771b77eee0834886774ee5476609 100644
--- a/lib_com/gs_preech_fx.c
+++ b/lib_com/gs_preech_fx.c
@@ -177,9 +177,10 @@ void pre_echo_att_ivas_fx(
     move16();
     Word16 ratio_fx;
     Word16 attack_pos_fx, i;
-    Word32 L_tmp, L_tmp1;
-    Word16 tmp, n1, n2, exp, frac1, frac2;
+    Word32 L_tmp;
+    Word16 tmp, tmp_e;
     Word32 etmp1_fx;
+    Word16 etmp_e;
     Word16 att_len;
 
     test();
@@ -220,32 +221,19 @@ void pre_echo_att_ivas_fx(
         IF( GT_32( etmp_fx, *Last_frame_ener_fx ) && attack_pos_fx > 0 )
         {
             /* Find the average energy before the attack */
-            L_tmp = sum32_fx( finc_fx, attack_pos_fx );                  /*Q1 */
-            L_tmp1 = L_shr( L_mult( attack_pos_fx, attack_pos_fx ), 1 ); /*Q0 */
-            tmp = round_fx( Isqrt( L_tmp1 ) );                           /*Q15 */
-            L_tmp = L_shr( L_tmp, 2 );                                   /*Q1 ; ATT_SEG_LEN=4 */
-            etmp_fx = Mult_32_16( L_tmp, tmp );                          /*Q1 */
-
-            etmp_fx = L_shr( etmp_fx, add( 1 - 4, shl( Q_new, 1 ) ) ); /* makes etmp i nQ4 as *Last_frame_ener_fx */
-                                                                       /* Find the correction factor and apply it before the attack */
-                                                                       /*   ratio = (float)sqrt(*Last_frame_ener/etmp);*/
-                                                                       /*         = isqrt(etmp/(*Last_frame_ener))			*/
-            etmp_fx = L_max( etmp_fx, 1 );
-            *Last_frame_ener_fx = L_max( *Last_frame_ener_fx, 1 );
-            move32();
-            n1 = norm_l( etmp_fx );
-            n2 = norm_l( *Last_frame_ener_fx );
-
-            n1 = sub( n1, 1 );
-            exp = sub( n1, n2 );
-
-            frac1 = round_fx( L_shl( etmp_fx, n1 ) );
-            frac2 = round_fx_sat( L_shl_sat( *Last_frame_ener_fx, n2 ) );
-            L_tmp = L_mult0( 128, div_s( frac1, frac2 ) ); /* s = gain_out / gain_in */
-            L_tmp = L_shr( L_tmp, exp );                   /* add exponent */
+            etmp_fx = sum32_fx( finc_fx, attack_pos_fx );
+            etmp_e = sub( 31, add( shl( Q_new, 1 ), 1 ) );
+            etmp_fx = L_add( etmp_fx, L_shr( 21474836 /*0.01 in Q31*/, etmp_e ) ); /* etmp = etmp + 0.01;   (exp = etmp_e) */
+            etmp_fx = L_deposit_h( BASOP_Util_Divide3232_Scale( etmp_fx, L_mult0( attack_pos_fx, ATT_SEG_LEN ), &tmp_e ) );
+            tmp_e = add( tmp_e, sub( etmp_e, 31 ) );
+            etmp_e = tmp_e;
+            move16();
 
-            L_tmp = Isqrt( L_tmp );
-            ratio_fx = round_fx( L_shl( L_tmp, 9 ) );
+            /* Find the correction factor and apply it before the attack */
+            tmp = BASOP_Util_Divide3232_Scale( *Last_frame_ener_fx, etmp_fx, &tmp_e ); /* numerator Q = 2 * Q_new + 1;  denominator Q = 31 - tmp_e */
+            tmp_e = add( tmp_e, sub( sub( 31, etmp_e ), add( shl( Q_new, 1 ), 1 ) ) ); /* tmp_e = tmp_e + (31 - tmp_e) - (2 * Q_new + 1) */
+            tmp = Sqrt16( tmp, &tmp_e );
+            ratio_fx = shr( tmp, sub( 2, tmp_e ) ); /* Q13 */
 
             /* Pre-echo atttenuation should never increase the energy */
             ratio_fx = s_min( ratio_fx, 8192 /* 1 in Q13 */ ); /* Q13 */