diff --git a/lib_enc/cod4t64_fast.c b/lib_enc/cod4t64_fast.c
index 1a1383d4121d2d2ffd95ea78bd1978fda445d8d9..93bcc1ce3ffe44ca66128e467dbf5cf03d4c98ac 100644
--- a/lib_enc/cod4t64_fast.c
+++ b/lib_enc/cod4t64_fast.c
@@ -770,7 +770,30 @@ void acelp_fast_fx(
                     alp_pos3++;
                 }
 
-                i = emaximum_32fx( Q_dn, dn, L_subfr, &L_tmp1 );
+                Word16 k;
+                Word64 W_tmp, W_tmp1;
+                Word64 emax;
+
+                emax = W_mult0_32_32( dn[0], dn[0] );
+                i = 0;
+                move16();
+
+                FOR( k = 1; k < L_subfr; k++ )
+                {
+                    W_tmp = W_mult0_32_32( dn[k], dn[k] );
+                    W_tmp1 = W_sub( W_tmp, emax );
+                    if ( W_tmp1 > 0 )
+                    {
+                        i = k;
+                        move16();
+                    }
+                    if ( LE_64( emax, W_tmp ) )
+                    {
+                        emax = W_tmp;
+                        move64();
+                    }
+                }
+
                 track = i % nb_tracks;
                 move16();