diff --git a/lib_com/ivas_prot.h b/lib_com/ivas_prot.h
index 4a8dc7610e4eaca5d567ca659fe0ec79bc2767c4..3538f28f7c53a018adb1c2ca0ef52f3b47a7fb68 100755
--- a/lib_com/ivas_prot.h
+++ b/lib_com/ivas_prot.h
@@ -2950,7 +2950,9 @@ ivas_error stereo_memory_enc(
     CPE_ENC_HANDLE hCPE,                                        /* i  : CPE encoder structure                   */
     const int32_t input_Fs,                                     /* i  : input sampling rate                     */
     const int16_t max_bwidth,                                   /* i  : maximum audio bandwidth                 */
+#ifndef FIX_1594_TDM_LAST_RATIO
     float *tdm_last_ratio,                                      /* o  : TD stereo last ratio                    */
+#endif
     const IVAS_FORMAT ivas_format,                              /* i  : IVAS format                             */
     const int16_t nchan_transport                               /* i  : number transport chans                  */
 );
diff --git a/lib_com/options.h b/lib_com/options.h
index a24b82b9a94438b09210f048b4b81085683bae0b..e4ec0a97c493c6569a210b88b69d92dfbaaa915b 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -166,6 +166,7 @@
 #define FIX_FLOAT_1582_STEREO_DFT_QUANTIZE_ITD          /* FhG: float issue 1582: Remove unncessary statement from stereo_dft_quantize_itd() */
 #define FIX_1585_ASAN_FORMAT_SW_ALT                     /* VA,FhG: float issues 1585,1593: alternative fix memory leaks with format switching */
 #define FIX_2570_BUF_OVFL                               /* Orange: basop issue 2570: global-buffer-overflow in lib_rend/ivas_objectRenderer_sources_fx.c */
+#define FIX_1594_TDM_LAST_RATIO                         /* VA: float issue 1594: remove obsolete argument 'tdm_last_ratio' from stereo_memory_enc () */
 
 /* #################### End BE switches ################################## */
 
diff --git a/lib_enc/ivas_cpe_enc.c b/lib_enc/ivas_cpe_enc.c
index 9927ccb9e4133b41e96f564381ee8729c74fb12f..ad884e3cdc69a6b5e7f03686b586fe36ce981d28 100644
--- a/lib_enc/ivas_cpe_enc.c
+++ b/lib_enc/ivas_cpe_enc.c
@@ -95,13 +95,15 @@ ivas_error ivas_cpe_enc(
     float fft_buff[CPE_CHANNELS][2 * L_FFT];                                 /* FFT buffer                               */
     int16_t tdm_ratio_idx, tdm_ratio_idx_SM;                                 /* temp. TD stereo parameters               */
     int16_t tdm_SM_or_LRTD_Pri;                                              /* temp. TD stereo parameters               */
-    float tdm_last_ratio;                                                    /* temp. TD stereo parameters               */
-    int16_t nb_bits;                                                         /* number of DFT stereo side bits           */
-    float fr_bands[CPE_CHANNELS][2 * NB_BANDS];                              /* energy in frequency bands                 */
-    float Etot_LR[CPE_CHANNELS];                                             /* total energy                              */
-    float lf_E[CPE_CHANNELS][2 * VOIC_BINS];                                 /* per bin spectrum energy in lf             */
-    int16_t localVAD_HE_SAD[CPE_CHANNELS];                                   /* HE-SAD flag without hangover, LR channels */
-    float band_energies_LR[2 * NB_BANDS];                                    /* energy in critical bands without minimum noise floor E_MIN */
+#ifndef FIX_1594_TDM_LAST_RATIO
+    float tdm_last_ratio; /* temp. TD stereo parameters               */
+#endif
+    int16_t nb_bits;                            /* number of DFT stereo side bits           */
+    float fr_bands[CPE_CHANNELS][2 * NB_BANDS]; /* energy in frequency bands                 */
+    float Etot_LR[CPE_CHANNELS];                /* total energy                              */
+    float lf_E[CPE_CHANNELS][2 * VOIC_BINS];    /* per bin spectrum energy in lf             */
+    int16_t localVAD_HE_SAD[CPE_CHANNELS];      /* HE-SAD flag without hangover, LR channels */
+    float band_energies_LR[2 * NB_BANDS];       /* energy in critical bands without minimum noise floor E_MIN */
     float orig_input[CPE_CHANNELS][L_FRAME48k];
     float Etot_last[CPE_CHANNELS];
     int32_t tmp, input_Fs;
@@ -133,8 +135,9 @@ ivas_error ivas_cpe_enc(
     tdm_SM_or_LRTD_Pri = 0;
     tdm_ratio_idx = -1;
     tdm_ratio_idx_SM = -1;
+#ifndef FIX_1594_TDM_LAST_RATIO
     tdm_last_ratio = 0;
-
+#endif
 #ifdef DEBUGGING
     if ( hCPE->hCoreCoder[0]->ini_frame == 0 )
     {
@@ -205,7 +208,11 @@ ivas_error ivas_cpe_enc(
      * dynamically allocate data structures depending on the actual stereo mode
      *----------------------------------------------------------------*/
 
+#ifdef FIX_1594_TDM_LAST_RATIO
+    if ( ( error = stereo_memory_enc( hCPE, input_Fs, max_bwidth, ivas_format, st_ivas->nchan_transport ) ) != IVAS_ERR_OK )
+#else
     if ( ( error = stereo_memory_enc( hCPE, input_Fs, max_bwidth, &tdm_last_ratio, ivas_format, st_ivas->nchan_transport ) ) != IVAS_ERR_OK )
+#endif
     {
         return error;
     }
diff --git a/lib_enc/ivas_stereo_switching_enc.c b/lib_enc/ivas_stereo_switching_enc.c
index 1040ca20cf0d2701113490e017c2518aa2bf3ca7..6d66bf7c9e099c2c6d0d43ecca07cf6c3d6a0b09 100644
--- a/lib_enc/ivas_stereo_switching_enc.c
+++ b/lib_enc/ivas_stereo_switching_enc.c
@@ -218,10 +218,12 @@ static void deallocate_CoreCoder_enc(
  *-------------------------------------------------------------------*/
 
 ivas_error stereo_memory_enc(
-    CPE_ENC_HANDLE hCPE,           /* i  : CPE encoder structure   */
-    const int32_t input_Fs,        /* i  : input sampling rate     */
-    const int16_t max_bwidth,      /* i  : maximum audio bandwidth */
-    float *tdm_last_ratio,         /* o  : TD stereo last ratio    */
+    CPE_ENC_HANDLE hCPE,      /* i  : CPE encoder structure   */
+    const int32_t input_Fs,   /* i  : input sampling rate     */
+    const int16_t max_bwidth, /* i  : maximum audio bandwidth */
+#ifndef FIX_1594_TDM_LAST_RATIO
+    float *tdm_last_ratio, /* o  : TD stereo last ratio    */
+#endif
     const IVAS_FORMAT ivas_format, /* i  : ivas format             */
     const int16_t nchan_transport  /* i  : number transport chans  */
 )
@@ -237,11 +239,12 @@ ivas_error stereo_memory_enc(
      * save parameters from structures that will be freed
      *---------------------------------------------------------------*/
 
+#ifndef FIX_1594_TDM_LAST_RATIO
     if ( hCPE->last_element_mode == IVAS_CPE_TD )
     {
         *tdm_last_ratio = hCPE->hStereoTD->tdm_last_ratio; /* note: this must be set to local variable before data structures are allocated/deallocated */
     }
-
+#endif
     if ( hCPE->hStereoTCA != NULL && hCPE->last_element_mode == IVAS_CPE_DFT )
     {
         set_s( hCPE->hStereoTCA->prevCorrLagStats, (int16_t) hCPE->hStereoDft->hItd->itd[1], 3 );