diff --git a/lib_enc/ivas_mc_param_enc_fx.c b/lib_enc/ivas_mc_param_enc_fx.c
index d0316be0ff0de173e84415dc2bfe26286c531749..22eacdb32b9eab6291c8a29388e2a20ca12a0cc1 100644
--- a/lib_enc/ivas_mc_param_enc_fx.c
+++ b/lib_enc/ivas_mc_param_enc_fx.c
@@ -2222,7 +2222,7 @@ static void ivas_param_mc_dec2bin_fx(
     /* convert value to bitstream, MSB first */
     FOR( idx = 0; idx < N; idx++ )
     {
-        bits[idx] = (UWord16) s_and( shr( val, sub( N, sub( 1, idx ) ) ), 1 );
+        bits[idx] = (UWord16) s_and( shr( val, sub( sub( N, 1 ), idx ) ), 1 );
         move16();
     }