diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100755
new mode 100644
index 2e7b43131ae5f560a6aba5983d888da2432ac690..3fe9b252dbcf56dfa605cac55ba1f0aa891187f5
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -170,6 +170,7 @@
 #define NONBE_FIX_BINAURAL_ROOM_IR_REVERBERATOR               /* FhG: re-enable acidentially disabled reverberator for BINAURAL_ROOM_IR */
 #define NONBE_FIX_907_VLBR_DIRAC_BAND_MAPPING                 /* Dlb: issue 907: fix for band mapping at VLBR */
 #define NONBE_FIX_869_MASA_PREREND_MERGE                      /* Nokia: issue: #869: MASA pre-rend not updating energy */
+#define NONBE_FIX_931_IGF_STEREO_DEC_NOISE	                  /* FhG: issue #931: fix noise substitution in the stereo IGF decoder      */
 
 /* ##################### End NON-BE switches ########################### */
 
diff --git a/lib_dec/igf_dec.c b/lib_dec/igf_dec.c
index 8095f6da41a89fe26f89272563e2f3345d22db25..5c727e3949a45ecd4abfc8765bfe123e38d90737 100755
--- a/lib_dec/igf_dec.c
+++ b/lib_dec/igf_dec.c
@@ -490,7 +490,11 @@ static void IGF_prepStereo(
             {
                 if ( hPrivateDataL->n_noise_bands_off )
                 {
+#ifdef NONBE_FIX_931_IGF_STEREO_DEC_NOISE
+                    IGF_replaceTCXNoise_2_new( src_specL, TCXNoiseL, strt_cpy, stop, hPrivateDataL->totalNoiseNrg_off, hPrivateDataL->n_noise_bands_off, hInfoL->nfSeed );
+#else
                     IGF_replaceTCXNoise_2_new( igf_specL, TCXNoiseL, strt_cpy, stop, hPrivateDataL->totalNoiseNrg_off, hPrivateDataL->n_noise_bands_off, hInfoL->nfSeed );
+#endif
                 }
                 sel_specL = src_specL;
             }
@@ -507,7 +511,11 @@ static void IGF_prepStereo(
             {
                 if ( hPrivateDataR->n_noise_bands_off )
                 {
+#ifdef NONBE_FIX_931_IGF_STEREO_DEC_NOISE
+                    IGF_replaceTCXNoise_2_new( src_specR, TCXNoiseR, strt_cpy, stop, hPrivateDataR->totalNoiseNrg_off, hPrivateDataR->n_noise_bands_off, hInfoR->nfSeed );
+#else
                     IGF_replaceTCXNoise_2_new( igf_specR, TCXNoiseR, strt_cpy, stop, hPrivateDataR->totalNoiseNrg_off, hPrivateDataR->n_noise_bands_off, hInfoR->nfSeed );
+#endif
                 }
                 sel_specR = src_specR;
             }
@@ -574,7 +582,11 @@ static void IGF_prepStereo(
                 {
                     if ( hPrivateDataL->n_noise_bands_off )
                     {
+#ifdef NONBE_FIX_931_IGF_STEREO_DEC_NOISE
+                        IGF_replaceTCXNoise_2_new( src_specL, TCXNoiseL, strt_cpy, stop, hPrivateDataL->totalNoiseNrg_off, hPrivateDataL->n_noise_bands_off, hInfoL->nfSeed );
+#else
                         IGF_replaceTCXNoise_2_new( igf_specL, TCXNoiseL, strt_cpy, stop, hPrivateDataL->totalNoiseNrg_off, hPrivateDataL->n_noise_bands_off, hInfoL->nfSeed );
+#endif
                     }
                     sel_specL = src_specL;
                 }
@@ -591,7 +603,11 @@ static void IGF_prepStereo(
                 {
                     if ( hPrivateDataR->n_noise_bands_off )
                     {
+#ifdef NONBE_FIX_931_IGF_STEREO_DEC_NOISE
+                        IGF_replaceTCXNoise_2_new( src_specR, TCXNoiseR, strt_cpy, stop, hPrivateDataR->totalNoiseNrg_off, hPrivateDataR->n_noise_bands_off, hInfoR->nfSeed );
+#else
                         IGF_replaceTCXNoise_2_new( igf_specR, TCXNoiseR, strt_cpy, stop, hPrivateDataR->totalNoiseNrg_off, hPrivateDataR->n_noise_bands_off, hInfoR->nfSeed );
+#endif
                     }
                     sel_specR = src_specR;
                 }