diff --git a/lib_com/options.h b/lib_com/options.h
index 6983f2140f52c0b66706bf704a5b6b9f2d6e186b..c2fc60a11ba78937bb7009b033136ecf7fd38d2c 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -223,6 +223,7 @@
 #define NONBE_FIX_1000_G1_G2_SWB_TBE                    /* VA: issue 1000: avoid div by zero due to g1 + g2 being zero in SWB TBE */
 #define FIX_699_FILE_READER_JBM_TSM                     /* VA: issue 699: complement FileReader_getFilePath() logic for TSM and JBM */
 #define FIX_997_REMOVE_SPAR_DEC_UPMIXER                 /* VA: issue 997: remove obsolete function ivas_spar_dec_upmixer() */
+#define FIX_1003_PARAMISM_BINAURAL_RECONFIG_USAN        /* FhG: fix for #1003: fix USAN caused by ParamISM reconfig                    */
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_dec/ivas_ism_dec.c b/lib_dec/ivas_ism_dec.c
index 0a424c24cd4246f849a617f237252e57a4854e5f..9eeefebfd11e2625af73982b17be7526e124ac85 100644
--- a/lib_dec/ivas_ism_dec.c
+++ b/lib_dec/ivas_ism_dec.c
@@ -343,11 +343,13 @@ static ivas_error ivas_ism_bitrate_switching_dec(
         tc_nchan_allocate_new = tc_nchan_tc_new;
         tc_nchan_full_new = tc_nchan_tc_new;
 
+#ifndef FIX_1003_PARAMISM_BINAURAL_RECONFIG_USAN
         if ( st_ivas->renderer_type == RENDERER_BINAURAL_PARAMETRIC || st_ivas->renderer_type == RENDERER_BINAURAL_PARAMETRIC_ROOM || st_ivas->renderer_type == RENDERER_STEREO_PARAMETRIC )
         {
             tc_nchan_allocate_new = 2 * BINAURAL_CHANNELS;
             tc_nchan_full_new = tc_nchan_allocate_new;
         }
+#endif
 
         if ( st_ivas->ism_mode == ISM_MODE_PARAM && ( st_ivas->renderer_type != RENDERER_MONO_DOWNMIX && st_ivas->renderer_type != RENDERER_DISABLE && st_ivas->renderer_type != RENDERER_BINAURAL_PARAMETRIC && st_ivas->renderer_type != RENDERER_BINAURAL_PARAMETRIC_ROOM ) )
         {