diff --git a/lib_enc/enc_acelpx_fx.c b/lib_enc/enc_acelpx_fx.c
index 240f9859c84f2748e544432bf47a9ff619bfae59..1a17a0f9c2a7b1974c63f5e9aca4204e0dd86c40 100644
--- a/lib_enc/enc_acelpx_fx.c
+++ b/lib_enc/enc_acelpx_fx.c
@@ -623,7 +623,7 @@ void E_ACELP_4tsearchx_ivas_fx(
     /* Init to avoid crash when the search does not find a solution */
     FOR( k = 0; k < nb_pulse; k++ )
     {
-        codvec[k] = k;
+        codvec[k] = s_and( k, 3 );
         move16();
     }