diff --git a/lib_com/ivas_cnst.h b/lib_com/ivas_cnst.h
index 4080485f60dae0c875c5133e06e6f953a33e24bc..0c84499778e22db170b034ef2ba6a4ca3b16b62e 100644
--- a/lib_com/ivas_cnst.h
+++ b/lib_com/ivas_cnst.h
@@ -887,7 +887,12 @@ enum fea_names
 #define MDCT_ST_PLC_FADEOUT_DELAY_4_LSP_FADE    3
 
 typedef enum {
+#ifdef FIX_619_ADD_UNDEF_VAL_FOR_CONCEALMENT_MODE
+    NOISE_GEN_MODE_UNDEF = -1,
+    EQUAL_CORES = 0,
+#else
     EQUAL_CORES,
+#endif
     TCX10_IN_0_TCX20_IN_1,
     TCX20_IN_0_TCX10_IN_1,
 } TONALMDCTCONC_NOISE_GEN_MODE;
diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100644
new mode 100755
index db585550d02d406affbcab519e892bdc2164aef9..7197d86b75fa17e489fe0e4b310c8d46a6b2bebe
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -197,6 +197,7 @@
 
 #define SPLIT_REND_WITH_HEAD_ROT                        /* Dlb,FhG: Split Rendering contributions 21 and 35 */
 
+#define FIX_619_ADD_UNDEF_VAL_FOR_CONCEALMENT_MODE      /* FhG: fix usan error */
 #define FIX_622_SILENCE_USAN_WARNING                    /* FhG: silenceusan warning in ifft code */
 
 /* ################## End BE DEVELOPMENT switches ######################### */
diff --git a/lib_dec/ivas_mdct_core_dec.c b/lib_dec/ivas_mdct_core_dec.c
index deb62940661183ffd59ad804b8a7b930f79a0820..f201decee14f06bc850e69ba92ce4e58042e7ff7 100644
--- a/lib_dec/ivas_mdct_core_dec.c
+++ b/lib_dec/ivas_mdct_core_dec.c
@@ -526,7 +526,11 @@ void ivas_mdct_core_invQ(
 
     sts = hCPE->hCoreCoder;
     bfi = sts[0]->bfi;
+#ifdef FIX_619_ADD_UNDEF_VAL_FOR_CONCEALMENT_MODE
+    noise_gen_mode_bfi = NOISE_GEN_MODE_UNDEF;
+#else
     noise_gen_mode_bfi = -1;
+#endif
 
     set_f( xn_buf, 0, L_MDCT_OVLP_MAX + L_FRAME_PLUS + L_MDCT_OVLP_MAX );
     set_s( total_nbbits, 0, CPE_CHANNELS );