diff --git a/lib_com/options.h b/lib_com/options.h
index a5e89debb5c5ee22a06ffe2dffeab37221948a2d..c0e2cf8f7c7f5c22243e2c21f059952e97bec2e7 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -211,6 +211,7 @@
 #define FIX_998_UNUSED_FUNCTION                         /* FhG: issue 998: delete unused funtion ivas_dirac_dec_get_response_split_order */ 
 #define NONBE_FIX_1014_1015_1016_OSBA_JBM_STEREO             /* FhG: issues #1014, #1015, #1016: fix tc buffer info update in the discrete ism renderer */
 #define NONBE_FIX_987_PARAMC_BINAURAL_REVERB_RENDERING       /* FhG: issue 987: solution b: downmix HOA3 to stereo a input for the reverberator */
+#define NONBE_FIX_1006_PAST_DMX_NRG_ERROR               /* Eri/FhG: Issue 1006: Bug fix in ivas_stereo_dft_dec not replicated in ivas_stereo_dft_dec_dmx */
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_dec/ivas_stereo_dft_dec_dmx.c b/lib_dec/ivas_stereo_dft_dec_dmx.c
index 640206ad21063c8aaab3534a7c49260169197a52..2fba8e5e197f3289910f7b8bc3418684da0706dc 100644
--- a/lib_dec/ivas_stereo_dft_dec_dmx.c
+++ b/lib_dec/ivas_stereo_dft_dec_dmx.c
@@ -229,7 +229,11 @@ void stereo_dft_unify_dmx(
         if ( st0->bfi && !prev_bfi )
         {
             int16_t idx_k0, idx_k1;
+#ifdef NONBE_FIX_1006_PAST_DMX_NRG_ERROR
+            idx_k0 = ( hStereoDft->past_DMX_pos + STEREO_DFT_PAST_MAX - 1 ) % STEREO_DFT_PAST_MAX;
+#else
             idx_k0 = ( hStereoDft->past_DMX_pos + 1 ) % STEREO_DFT_PAST_MAX;
+#endif
             idx_k1 = ( idx_k0 + 1 ) % STEREO_DFT_PAST_MAX;
 
             /*dmx energy memory*/