diff --git a/lib_com/options.h b/lib_com/options.h
index 3c9313d179bac6c24318b2343243465856d4fd6c..e9b305b3a045bc51e41c1fff3856c59958b65d41 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -144,6 +144,7 @@
 #define FIX_FMSW_DEC_2                                  /* float issue 1575: fix crash for format switching when bitsream starts with EVS */
 #define FIX_BASOP_2561_STEREO_DFT_ENC_COMPUTE_ITD       /* BASOP issue 2561: fix diffs in stereo_dft_enc_compute_itd() between float and BASOP */
 #define FIX_BASOP_2517_CLICK_IN_OMASA_LTV               /* FhG: BASOP #2517: preserve precision by removing one-bit headroom from Q_min and allowing saturation during buffer scaling */
+#define FIX_BASOP_2559_Q_SYNTH_HISTORY_RESET            /* FhG: BASOP issue 2559: reset hTcxDec->q_synth_history_fx in allocate_CoreCoder_TCX_fx() */
 
 /* ##################### End NON-BE switches ########################### */
 
diff --git a/lib_dec/ivas_stereo_switching_dec_fx.c b/lib_dec/ivas_stereo_switching_dec_fx.c
index 554ac92bab597ab25681e7de32a9ce82e96c4cd1..985e1d4615253c67342e0fa04b5284470f799828 100644
--- a/lib_dec/ivas_stereo_switching_dec_fx.c
+++ b/lib_dec/ivas_stereo_switching_dec_fx.c
@@ -82,6 +82,10 @@ static ivas_error allocate_CoreCoder_TCX_fx(
         st->hTcxDec->q_old_synth = 0;
         move16();
         set16_fx( st->hTcxDec->synth_history_fx, 0, L_PROT48k + L_FRAME48k );
+#ifdef FIX_BASOP_2559_Q_SYNTH_HISTORY_RESET
+        st->hTcxDec->q_synth_history_fx = 0;
+        move16();
+#endif
     }
 
     IF( st->hTcxCfg == NULL )