diff --git a/lib_enc/ivas_ism_dtx_enc_fx.c b/lib_enc/ivas_ism_dtx_enc_fx.c
index 64b8991d6fe0ad2263957824914c70e8cd92da18..1a41102456159b6b9228c1c8239d724e0c3b746c 100644
--- a/lib_enc/ivas_ism_dtx_enc_fx.c
+++ b/lib_enc/ivas_ism_dtx_enc_fx.c
@@ -445,9 +445,9 @@ void ivas_ism_coh_estim_dtx_enc_fx(
     Word16 sce_id, i;
     Word32 acorr_ene_fx[MAX_NUM_OBJECTS], xcorr_ene_fx;
     Word16 acorr_ene_e[MAX_NUM_OBJECTS], xcorr_ene_e;
-    Word16 norm_inp;
-    Word16 tot_exp;
-    Word32 scaled_inp;
+    Word16 norm_inp, norm_inp0;
+    Word16 tot_exp, tot_exp2;
+    Word32 scaled_inp, scaled_inp0;
     set16_fx( acorr_ene_e, 0, MAX_NUM_OBJECTS );
 
     IF( EQ_16( nchan_transport, 1 ) )
@@ -493,10 +493,13 @@ void ivas_ism_coh_estim_dtx_enc_fx(
         {
             norm_inp = norm_l( st->input32_fx[i] );
             scaled_inp = L_shl( st->input32_fx[i], norm_inp );
-            tot_exp = shl( sub( 20, norm_inp ), 1 );
+            tot_exp = shl( sub( sub( 31, st->q_inp32 ), norm_inp ), 1 );
             acorr_ene_fx[sce_id] = BASOP_Util_Add_Mant32Exp( acorr_ene_fx[sce_id], acorr_ene_e[sce_id], Mult_32_32( scaled_inp, scaled_inp ), tot_exp, &acorr_ene_e[sce_id] ); /* exp(acorr_ene_e) */
             move32();
-            xcorr_ene_fx = BASOP_Util_Add_Mant32Exp( xcorr_ene_fx, xcorr_ene_e, Mult_32_32( scaled_inp, scaled_inp ), tot_exp, &xcorr_ene_e ); /* exp(xcorr_ene_e) */
+            norm_inp0 = norm_l( st_id0->input32_fx[i] );
+            scaled_inp0 = L_shl( st_id0->input32_fx[i], norm_inp0 );
+            tot_exp2 = add( sub( sub( 31, st_id0->q_inp32 ), norm_inp0 ), sub( sub( 31, st->q_inp32 ), norm_inp ) );
+            xcorr_ene_fx = BASOP_Util_Add_Mant32Exp( xcorr_ene_fx, xcorr_ene_e, Mult_32_32( scaled_inp, scaled_inp0 ), tot_exp2, &xcorr_ene_e ); /* exp(xcorr_ene_e) */
         }
         Word16 coh_e;
         Word16 temp_e = acorr_ene_e[hISMDTX->sce_id_dtx] + acorr_ene_e[sce_id];