diff --git a/lib_com/options.h b/lib_com/options.h
index 94f06101010eea882eef2871a6dbb1a03567591c..a5e89debb5c5ee22a06ffe2dffeab37221948a2d 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -202,6 +202,7 @@
 #define FIX_INV_DIFFUSE_WEIGHT                          /* Orange : Fix error in energy compensation in late binaural */
 #endif
 
+#define FIX_1002_DEC_PHASE_ECU_USAN_OF_PHASE            /* Eri: issue #1002, usan-value-out-of-range-for-int16, kept BE for PLC-conditions   */
 //#define FIX_777_COMBI_RENDER_CONFIG_FILE                /* Philips: Fix for combined renderer config file support */
 #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_991_PARAMBIN_BINARY_HRTF */             /* Nokia: issue #991: fix using of binary file HRTF in ParamBin (to actiate when USE_NEW_HRTF_BINARY_FILE_FORMAT and FIX_777_COMBI_RENDER_CONFIG_FILE are on  )*/
diff --git a/lib_dec/FEC_HQ_phase_ecu.c b/lib_dec/FEC_HQ_phase_ecu.c
index 9f1a928e27e0cd20d0c3c6661a5e5e30fdb11ae1..e6b9f83bdf329d133e3ecc719025e4f1e8ab0341 100644
--- a/lib_dec/FEC_HQ_phase_ecu.c
+++ b/lib_dec/FEC_HQ_phase_ecu.c
@@ -1092,7 +1092,13 @@ static void subst_spec(
         }
 
         Xph = corr_phase[m];
+
+#ifdef FIX_1002_DEC_PHASE_ECU_USAN_OF_PHASE
+        /* extract fractional phase integer index in the range [0...1023] */
+        Xph_short = (int16_t) ( 0x000003ff & (int32_t) ( ( Xph * 512 ) / EVS_PI ) );
+#else
         Xph_short = (int16_t) ( ( (int32_t) ( Xph * 512 / EVS_PI ) ) % 32768 ) & 0x03ff;
+#endif
         if ( Xph_short >= 512 )
         {
             sin_F = -sincos_t_ext[Xph_short - 512];
@@ -1136,7 +1142,11 @@ static void subst_spec(
                     mag_chg_local *= 0.5f + ( 1.0f - ( 1.0f / PHASE_DITH ) * ph_dith ) * 0.5f;
                 }
 
+#ifdef FIX_1002_DEC_PHASE_ECU_USAN_OF_PHASE
+                Xph_short = (int16_t) ( ( (int32_t) ( ( Xph * 512 ) / EVS_PI ) ) & 0x000003ff );
+#else
                 Xph_short = (int16_t) ( Xph * 512 / EVS_PI ) & 0x03ff;
+#endif
 
                 if ( Xph_short >= 512 )
                 {