diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100644
new mode 100755
index 9e9922fb4d3551ca7006c962ae0b838d75b90c59..0c0cd6e4f0a38a7e5ccad3ba6b0311fe632b8559
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -173,6 +173,7 @@
 #define NONBE_FIX_1004_USAN_DTX_MASA_NO_DIRS                  /* Nokia: fix USAN error caused by non-setting of correctly the number of MASA directions in DTX */
 #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 */
 #define NONBE_FIX_1010_STEREO_CNG_DIV_BY_ZERO                 /* Eri: Issue 1010: Division by zero in Stereo CNG */
 
 /* ##################### End NON-BE switches ########################### */
diff --git a/lib_dec/ivas_stereo_dft_dec_dmx.c b/lib_dec/ivas_stereo_dft_dec_dmx.c
index 3a4b6be20890334a8fdb76f0f077a447d706c77f..f3f9982ec8e079cd577e9aa9017b466c53b1d883 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*/