diff --git a/lib_dec/FEC_HQ_phase_ecu.c b/lib_dec/FEC_HQ_phase_ecu.c
index 061f392047bcce647b750cd8e1201e9e3086a676..da65786dc485ecb178b453c9601c253b365acd32 100644
--- a/lib_dec/FEC_HQ_phase_ecu.c
+++ b/lib_dec/FEC_HQ_phase_ecu.c
@@ -2155,7 +2155,11 @@ static void hq_phase_ecu(
     }
     else
     {
+#ifdef FIX_1179_USAN_PHASEECU
+        *time_offs = (int16_t) ( *time_offs + output_frame ); /* cast added for USAN, "+=" avoided as it may creat a truncation from int to int16_t  */
+#else
         *time_offs += output_frame;
+#endif
         if ( *time_offs <= 0 )
         {
             /* detect wrap around  of st->time_offs */