diff --git a/radio/src/telemetry/telemetry.cpp b/radio/src/telemetry/telemetry.cpp
index 25e335042..7e085488e 100644
--- a/radio/src/telemetry/telemetry.cpp
+++ b/radio/src/telemetry/telemetry.cpp
@@ -290,7 +290,9 @@ void telemetryInit(uint8_t protocol)
 #if defined(LUA)
     outputTelemetryBuffer.reset();
 #endif
+#if !defined(SIMU)
     telemetryPortSetDirectionInput();
+#endif
   }
   else if (protocol == PROTOCOL_TELEMETRY_SPEKTRUM) {
     // Spektrum's own small race RX (SPM4648) uses 125000 8N1, use the same since there is no real standard