diff --git a/lib_com/options.h b/lib_com/options.h
index 4a16a910be8843e3b159ac67de554a56ed9a69b6..cc75ea885dc221e03e2a7b64fe264fddd84de44f 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -171,6 +171,7 @@
 
 #define FIX_1540_EXPOSE_PT_IN_RTP_HEADER_API            /* Expose Payload Type setting in RTP Header */
 #define FIX_FLOAT_1569_REND_RENDER_CONFIG_CHECKS        /* Nokia: float issue 1569: fix render config checks in renderer */
+#define FIX_1571_BFI_COPY_ARRAY_CORRECT_LEN             /* FhG: issue 1571: use correct channel signal length for copying signal to buffer */
 
 /* ##################### End NON-BE switches ########################### */
 
diff --git a/lib_dec/ivas_mdct_core_dec.c b/lib_dec/ivas_mdct_core_dec.c
index e5ae980c6c4bb631357c611b336b3311be4d1e78..3cf8bfd48e3aa9b44addfa39b4997bacdea7e356 100644
--- a/lib_dec/ivas_mdct_core_dec.c
+++ b/lib_dec/ivas_mdct_core_dec.c
@@ -551,7 +551,11 @@ void ivas_mdct_core_invQ(
         L_frameTCX[0] = sts[0]->L_frameTCX_past;
         L_frameTCX[1] = sts[1]->L_frameTCX_past;
         mvr2r( sts[0]->hTonalMDCTConc->lastBlockData.spectralData, tmp_ms_sig[0], L_frameTCX[0] );
+#ifdef FIX_1571_BFI_COPY_ARRAY_CORRECT_LEN
+        mvr2r( sts[1]->hTonalMDCTConc->lastBlockData.spectralData, tmp_ms_sig[1], L_frameTCX[1] );
+#else
         mvr2r( sts[1]->hTonalMDCTConc->lastBlockData.spectralData, tmp_ms_sig[1], L_frameTCX[0] );
+#endif
         stereo_decoder_tcx( hCPE->hStereoMdct, ms_mask, x_0[1], &sts[0]->hTonalMDCTConc->lastBlockData.spectralData, &sts[1]->hTonalMDCTConc->lastBlockData.spectralData, &hCPE->hStereoMdct->mdct_stereo_mode[0], sts[0]->core, sts[1]->core, sts[0]->igf, L_frameTCX[0], L_frameTCX[1], 0, sts[0]->last_core, sts[1]->last_core, 1 );
     }