diff --git a/lib_com/ivas_cnst.h b/lib_com/ivas_cnst.h
index bff4a0cd516678fe2d515efa2784653c95faa89e..09e414867cb14a4dadfde15206cf779b1f7d0029 100644
--- a/lib_com/ivas_cnst.h
+++ b/lib_com/ivas_cnst.h
@@ -229,6 +229,9 @@ typedef enum
 /* format signaling in SID frames */
 #define SID_FORMAT_NBITS                        3                           /* Bit 0 | Bit 1 | Bit 2 */
                                                                             /*-------|-------|------ */
+#ifdef FIX_1384_MSAN_ivas_spar_dec_open
+#define SID_FORMAT_NONE                         (-0x1)                      /*    n/a|    n/a|    n/a*/
+#endif
 #define SID_DFT_STEREO                          0x0                         /*      0|      0|     0 */
 #define SID_MDCT_STEREO                         0x1                         /*      1|      0|     0 */
 #define SID_ISM                                 0x2                         /*      0|      1|     0 */
diff --git a/lib_com/options.h b/lib_com/options.h
index 1f18a03044e80c7ff576bdd5b308e83dde095045..48c4873ca9645f3ec3a6d09b66cfae5f6340172a 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -191,6 +191,7 @@
 #define NONBE_1293_CRASH_FIRST_FRAME_LOST               /* VA: issue 1293: fix G.192 decoder crash when first frame is lost */
 #define FIX_1384_MSAN_stereo_tcx_core_enc               /* VA: issue 1384: fix use-of-uninitialized value in stereo_tcx_core_enc() */
 #define NONBE_1303_REND_GRANULARITY                     /* VA: issue 1303: Renderer granularity revision */
+#define FIX_1384_MSAN_ivas_spar_dec_open                /* VA: issue 1386: fix use-of-uninitialized value in ivas_spar_dec_open() */
 
 // object-editing feature porting
 #define OBJ_EDITING_API                                 /* object editing changes related to the API */
diff --git a/lib_dec/ivas_init_dec.c b/lib_dec/ivas_init_dec.c
index 86f0629bb7345ca21a73565f76993e498d700a22..d8df608cf2a13667b679fd2845fc91f081a65e3c 100644
--- a/lib_dec/ivas_init_dec.c
+++ b/lib_dec/ivas_init_dec.c
@@ -1161,6 +1161,9 @@ ivas_error ivas_init_decoder_front(
     st_ivas->ism_mode = ISM_MODE_NONE;
     st_ivas->mc_mode = MC_MODE_NONE;
 
+#ifdef FIX_1384_MSAN_ivas_spar_dec_open
+    st_ivas->sid_format = SID_FORMAT_NONE;
+#endif
     st_ivas->sba_dirac_stereo_flag = 0;
 
     /* HRTF binauralization latency in ns */