diff --git a/openrtx/src/rtx/OpMode_M17.cpp b/openrtx/src/rtx/OpMode_M17.cpp
index 6a52c840..ad001abd 100644
--- a/openrtx/src/rtx/OpMode_M17.cpp
+++ b/openrtx/src/rtx/OpMode_M17.cpp
@@ -237,6 +237,12 @@ void OpMode_M17::startCodec()
     pthread_attr_t codecAttr;
     pthread_attr_init(&codecAttr);
     pthread_attr_setstacksize(&codecAttr, 16384);
+    #ifdef _MIOSIX
+    // Set priority of CODEC2 thread to the maximum one, the same of RTX thread.
+    struct sched_param param;
+    param.sched_priority = sched_get_priority_max(0);
+    pthread_attr_setschedparam(&codecAttr, &param);
+    #endif
     pthread_create(&codecThread, &codecAttr, threadFunc, NULL);
 }