diff --git a/radio/src/telemetry/frsky.cpp b/radio/src/telemetry/frsky.cpp
index dabdec56d..75dee9522 100644
--- a/radio/src/telemetry/frsky.cpp
+++ b/radio/src/telemetry/frsky.cpp
@@ -632,7 +632,7 @@ void telemetryInit(void)
     telemetryPortInit(FRSKY_SPORT_BAUDRATE);
   }
 
-#if defined(REVX)
+#if defined(REVX) && !defined(SIMU)
   if (serialInversion) {
     setMFP();
   }