diff --git a/lib_dec/ivas_tcx_core_dec_fx.c b/lib_dec/ivas_tcx_core_dec_fx.c
index 81b67ec10b994dec97c8656a0c502079912cba02..7cb567771f5280f58f23831eccabc20166a7a831 100644
--- a/lib_dec/ivas_tcx_core_dec_fx.c
+++ b/lib_dec/ivas_tcx_core_dec_fx.c
@@ -913,7 +913,9 @@ void stereo_tcx_core_dec_fx(
                 Word32 signal_out_32_fx[L_FRAME48k];
                 Word16 exp;
                 Copy_Scale_sig_16_32_no_sat( signal_out_fx, signal_out_32_fx, st->hFdCngDec->hFdCngCom->frameSize, Q6 );
+#ifndef FIX_1996_MASKING_NOISE
                 Copy_Scale_sig_16_32_no_sat( st->hFdCngDec->hFdCngCom->olapBufferSynth2, st->hFdCngDec->hFdCngCom->olapBufferSynth2_fx, shl( st->hFdCngDec->hFdCngCom->frameSize, 1 ), Q15 );
+#endif
                 generate_masking_noise_ivas_fx( signal_out_32_fx, &exp, st->hFdCngDec->hFdCngCom, st->hFdCngDec->hFdCngCom->frameSize, 0, 0, 0, st->element_mode, hStereoCng, nchan_out );
                 Copy_Scale_sig_32_16( signal_out_32_fx, signal_out_fx, st->hFdCngDec->hFdCngCom->frameSize, negate( exp ) );                                                            // Q0
                 Copy_Scale_sig_32_16( st->hFdCngDec->hFdCngCom->olapBufferSynth2_fx, st->hFdCngDec->hFdCngCom->olapBufferSynth2, shl( st->hFdCngDec->hFdCngCom->frameSize, 1 ), -Q15 ); // Q0