diff --git a/lib_com/ivas_stereo_td_bit_alloc.c b/lib_com/ivas_stereo_td_bit_alloc.c
index cdcfa3cbc10f49f2a435a4a2fc8770875f7ad724..07bdfb73a8bc0ad506554b79e8d020befc97db17 100644
--- a/lib_com/ivas_stereo_td_bit_alloc.c
+++ b/lib_com/ivas_stereo_td_bit_alloc.c
@@ -456,17 +456,48 @@ void td_stereo_param_updt(
     if ( tdm_use_IAWB_Ave_lpc == 1 )
     {
         mvr2r( IAWB_Ave, tdm_lsfQ_PCh, M );
+
+#ifdef FIX_1111_TDM_LSP_BUFFER
+        if ( tdm_lspQ_PCh != NULL )
+        {
+            lsf2lsp( tdm_lsfQ_PCh, tdm_lspQ_PCh, M, INT_FS_12k8 );
+        }
+#else
         lsf2lsp( tdm_lsfQ_PCh, tdm_lspQ_PCh, M, INT_FS_12k8 );
+#endif
     }
     else if ( flag_ACELP16k == 1 )
     {
+#ifdef FIX_1111_TDM_LSP_BUFFER
+        if ( tdm_lspQ_PCh != NULL )
+        {
+            mvr2r( lsp_old_PCh, tdm_lspQ_PCh, M );
+            lsp_convert_poly( tdm_lspQ_PCh, L_FRAME, 0 );
+            lsp2lsf( tdm_lspQ_PCh, tdm_lsfQ_PCh, M, INT_FS_12k8 );
+        }
+        else
+        {
+            float lsp_temp[M];
+            mvr2r( lsp_old_PCh, lsp_temp, M );
+            lsp_convert_poly( lsp_temp, L_FRAME, 0 );
+            lsp2lsf( lsp_temp, tdm_lsfQ_PCh, M, INT_FS_12k8 );
+        }
+#else
         mvr2r( lsp_old_PCh, tdm_lspQ_PCh, M );
         lsp_convert_poly( tdm_lspQ_PCh, L_FRAME, 0 );
         lsp2lsf( tdm_lspQ_PCh, tdm_lsfQ_PCh, M, INT_FS_12k8 );
+#endif
     }
     else
     {
+#ifdef FIX_1111_TDM_LSP_BUFFER
+        if ( tdm_lspQ_PCh != NULL )
+        {
+            mvr2r( lsp_old_PCh, tdm_lspQ_PCh, M );
+        }
+#else
         mvr2r( lsp_old_PCh, tdm_lspQ_PCh, M );
+#endif
         mvr2r( lsf_old_PCh, tdm_lsfQ_PCh, M );
     }
 
diff --git a/lib_com/options.h b/lib_com/options.h
index 02e3196e52d0c359de038b315a8ac36681f206ca..bd7e7965aeba7a811bb335d67eb794ec64bba46e 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -161,7 +161,7 @@
 
 
 #define FIX_1099_JBM_MD_HANDLE_ALLOC                    /* VA: issue 1099: Limit the allocation of `hJbmMetadata` handle to MASA and OMASA only */
-
+#define FIX_1111_TDM_LSP_BUFFER                         /* VA: issue 1111: remove unused buffer `tdm_lspQ_PCh[]' */
 
 /* #################### End BE switches ################################## */
 
diff --git a/lib_enc/ivas_core_enc.c b/lib_enc/ivas_core_enc.c
index 27161bec33b9df8d2231325bea95292c8adb5827..e8a3267687b2bee8825c8d791ac1f199862c441c 100644
--- a/lib_enc/ivas_core_enc.c
+++ b/lib_enc/ivas_core_enc.c
@@ -99,7 +99,11 @@ ivas_error ivas_core_enc(
     int16_t Voicing_flag[CPE_CHANNELS];
     float pitch_buf[CPE_CHANNELS][NB_SUBFR16k];
     int16_t unbits[CPE_CHANNELS];
+#ifdef FIX_1111_TDM_LSP_BUFFER
+    float tdm_lsfQ_PCh[M];
+#else
     float tdm_lspQ_PCh[M], tdm_lsfQ_PCh[M];
+#endif
     int16_t last_element_mode, tdm_Pitch_reuse_flag;
     int32_t element_brate, last_element_brate, input_Fs;
     int16_t diff_nBits;
@@ -270,7 +274,11 @@ ivas_error ivas_core_enc(
 
         if ( st->element_mode == IVAS_CPE_TD && n == 0 )
         {
+#ifdef FIX_1111_TDM_LSP_BUFFER
+            td_stereo_param_updt( st->lsp_old, st->lsf_old, pitch_buf[0], NULL, tdm_lsfQ_PCh, hStereoTD->tdm_Pri_pitch_buf, st->flag_ACELP16k, hStereoTD->tdm_use_IAWB_Ave_lpc );
+#else
             td_stereo_param_updt( st->lsp_old, st->lsf_old, pitch_buf[0], tdm_lspQ_PCh, tdm_lsfQ_PCh, hStereoTD->tdm_Pri_pitch_buf, st->flag_ACELP16k, hStereoTD->tdm_use_IAWB_Ave_lpc );
+#endif
         }
     }