diff --git a/lib_xua/src/core/mixer/mixer.xc b/lib_xua/src/core/mixer/mixer.xc
index 71e305ae..fe9dc766 100644
--- a/lib_xua/src/core/mixer/mixer.xc
+++ b/lib_xua/src/core/mixer/mixer.xc
@@ -365,9 +365,11 @@ static void mixer1(chanend c_host, chanend c_mix_ctl, chanend c_mixer2)
 
         /* Forward on Request for data to decouple thread */
         outuint(c_host, request);
-    
+
+#if (MAX_MIX_COUNT > 0) 
         /* Sync */
         outuint(c_mixer2, 0);
+#endif
 
         /* Between request to decouple and response ~ 400nS latency for interrupt to fire */
         select