diff --git a/lib_dec/er_dec_tcx_fx.c b/lib_dec/er_dec_tcx_fx.c
index bbe1276f1f2600fb60f8156701c57aea1ce4189e..ab1d7227966344496ee7c7b59f46d9e5177fc192 100644
--- a/lib_dec/er_dec_tcx_fx.c
+++ b/lib_dec/er_dec_tcx_fx.c
@@ -2105,7 +2105,7 @@ void con_tcx_ivas_fx(
 
     /* create aliasing and windowing need for transition to TCX10/5 */
     bufferCopyFx( syn + L_frame, hTcxDec->syn_Overl_TDACFB, shr( L_frame, 1 ), Q_syn, 0, -1, 0 );
-    hTcxDec->Q_syn_Overl_TDACFB = add( Q_syn, sub( Q_syn, -1 ) );
+    hTcxDec->Q_syn_Overl_TDACFB = add( Q_syn, -1 );
     move16();
 
     FOR( i = 0; i < W12; i++ )