diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index 0876aa6d8..0adec523c 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -2049,9 +2049,11 @@ getvalue_t convert16bitsTelemValue(uint8_t channel, ls_telemetry_value_t value)
 {
   getvalue_t result;
   switch (channel) {
+#if defined(FRSKY_SPORT)
     case TELEM_ALT:
       result = value * 100;
       break;
+#endif
     default:
       result = value;
       break;