diff --git a/lib_com/options.h b/lib_com/options.h
index 7b00f09aa0a1f88aae477ed91108755bb303bca7..5774d4a8b2b4511b47b2e6db23ab28b7914e776a 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -241,6 +241,7 @@
 /* all switches in this category should start with "CR_" */
 
 #define CR_FIX_585_MASA_2TC_DTX_EXT                     /* Nokia: issue 585: fixes transition artifacts in MASA 2TC DTX by applying correct condition */
+#define CR_FIX_639_HQ_ACELP_TRANSITION                  /* Ericsson: Issue 639: Wrong sampling rate of SWB TBE excitation memory in 16 kHz core for DFT Stereo@32 kbps */
 #define CR_FIX_586_BPF_DFT_MEM                          /* FhG: issue 586: set input memory of DFT analysis of BPF signal to zero for HQ core to fix issue with PLC and bitrate switching */
 #define CR_FIX_ISM_DTX_INFINITE_CNG_ON_TRAILING_SILENCE /* FhG: fix for cng in ISM DTX on sudden silence periods */
 
diff --git a/lib_dec/acelp_core_dec.c b/lib_dec/acelp_core_dec.c
index 8d5e9de34d67e9fad94e36773518d26078bd0bea..1a909ac037f5a88dc177e64f21d1b434ec559527 100644
--- a/lib_dec/acelp_core_dec.c
+++ b/lib_dec/acelp_core_dec.c
@@ -707,7 +707,18 @@ ivas_error acelp_core_dec(
             if ( st->last_core != ACELP_CORE && st->element_mode > EVS_MONO )
             {
                 /* Prepare ACB memory of old_bwe_exc */
+#ifdef CR_FIX_639_HQ_ACELP_TRANSITION
+                if ( st->L_frame == L_FRAME )
+                {
+                    lerp( old_exc, old_bwe_exc, L_EXC_MEM_DEC * HIBND_ACB_L_FAC, L_EXC_MEM_DEC );
+                }
+                else
+                {
+                    lerp( old_exc, old_bwe_exc, L_EXC_MEM_DEC * 2, L_EXC_MEM_DEC );
+                }
+#else
                 lerp( old_exc, old_bwe_exc, L_EXC_MEM_DEC * HIBND_ACB_L_FAC, L_EXC_MEM_DEC );
+#endif
             }
 
             /*-----------------------------------------------------------------*
diff --git a/lib_enc/acelp_core_enc.c b/lib_enc/acelp_core_enc.c
index d78f9bf25888ea73be399e04a4d086a681708366..ac6c820fa1baef922aa17907699b01c5e96898bf 100644
--- a/lib_enc/acelp_core_enc.c
+++ b/lib_enc/acelp_core_enc.c
@@ -461,7 +461,18 @@ ivas_error acelp_core_enc(
         if ( st->last_core != ACELP_CORE && st->element_mode > EVS_MONO )
         {
             /* Prepare ACB memory of old_bwe_exc */
+#ifdef CR_FIX_639_HQ_ACELP_TRANSITION
+            if ( st->L_frame == L_FRAME )
+            {
+                lerp( old_exc, old_bwe_exc, L_EXC_MEM_DEC * HIBND_ACB_L_FAC, L_EXC_MEM_DEC );
+            }
+            else
+            {
+                lerp( old_exc, old_bwe_exc, L_EXC_MEM_DEC * 2, L_EXC_MEM_DEC );
+            }
+#else
             lerp( old_exc, old_bwe_exc, L_EXC_MEM_DEC * HIBND_ACB_L_FAC, L_EXC_MEM_DEC );
+#endif
         }