diff --git a/lib_com/ivas_cnst.h b/lib_com/ivas_cnst.h
index 321745b9a6c2620cc295225aa6b36cefc3e3fc55..4e5f8871cfed61375177e1647afc3c7444647d92 100644
--- a/lib_com/ivas_cnst.h
+++ b/lib_com/ivas_cnst.h
@@ -249,6 +249,9 @@ 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 6afe8a2bde3c72358399cd012ced2a8f0ce215ad..cc7f82754f08cdfcdcadbb276c7180f76d34d8f4 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -112,6 +112,7 @@
 #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_fx.c b/lib_dec/ivas_init_dec_fx.c
index 2aaf6a1478d85457ef52b8cddd4ff03716250ede..0944f3d7d32768fac5987b818be2d17490f98a4f 100644
--- a/lib_dec/ivas_init_dec_fx.c
+++ b/lib_dec/ivas_init_dec_fx.c
@@ -1385,6 +1385,10 @@ ivas_error ivas_init_decoder_front(
     move32();
     st_ivas->mc_mode = MC_MODE_NONE;
     move32();
+#ifdef FIX_1384_MSAN_ivas_spar_dec_open
+    st_ivas->sid_format = SID_FORMAT_NONE;
+    move16();
+#endif
     st_ivas->sba_dirac_stereo_flag = 0;
     move16();