diff --git a/lib_com/options.h b/lib_com/options.h
index 7d7d95965dacd6c9a6f76f795b0a2a1b0f5a7b9d..123c0590c61fafc9e725d2f9bf9e294104003f1c 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -164,6 +164,7 @@
 #define FIX_2235_TD_RENDERER_WORD16                     /* Eri: For float: small synch with BASOP, removing unnecessary abs. BASOP: Use Word16 in TD renderer without converting to Word32 */
 #define FIX_FLOAT_1526_DIRAC_MEM_LEAK                   /* FhG: potential memory leak in DirAC handles in case of format switching */
 #define ALIGN_ACELP_CORE                                /* VA: align ACELP core functions with BASOP */
+#define FIX_1532_MSAN_ERR_AMR_FIRST_FRAME_IS_SID        /* FhG: fix msan complaint in AMR-WB when first frame is an SID */
 
 /* #################### End BE switches ################################## */
 
diff --git a/lib_dec/hf_synth.c b/lib_dec/hf_synth.c
index fe2bd60c0fe4be692e4c78f362b254826750c41f..9b4276ad950deca34d44fa599b227770d7d60bbc 100644
--- a/lib_dec/hf_synth.c
+++ b/lib_dec/hf_synth.c
@@ -441,6 +441,16 @@ void hf_synth_amr_wb(
             HF_corr_gain[i] = 2 * HP_gain[hf_gain[i]];
         }
     }
+#ifdef FIX_1532_MSAN_ERR_AMR_FIRST_FRAME_IS_SID
+    else
+    {
+        /* Initialize to fix clang-18 sanitizer complaint */
+        for ( i = 0; i < NB_SUBFR; ++i )
+        {
+            HF_corr_gain[i] = 1.0f;
+        }
+    }
+#endif
 
     /* inverse DCT transform of HF excitation */
     set_f( exc16k, 0.0f, L_FRAME16k );