diff --git a/radio/src/datastructs.h b/radio/src/datastructs.h
index 899190096..9ff05975a 100644
--- a/radio/src/datastructs.h
+++ b/radio/src/datastructs.h
@@ -381,25 +381,7 @@ PACK(struct TelemetrySensor {
     bool isPrecConfigurable() const;
     int32_t getPrecMultiplier() const;
     int32_t getPrecDivisor() const;
-    bool isSameInstance(TelemetryProtocol protocol, uint8_t instance)
-    {
-      if (this->instance == instance)
-        return true;
-
-      if (protocol == PROTOCOL_TELEMETRY_FRSKY_SPORT) {
-#if defined(SIMU)
-        if (((this->instance ^ instance) & 0x1F) == 0)
-          return true;
-#else
-        if (((this->instance ^ instance) & 0x9F) == 0 && (this->instance >> 5) != TELEMETRY_ENDPOINT_SPORT && (instance >> 5) != TELEMETRY_ENDPOINT_SPORT) {
-          this->instance = instance; // update the instance in case we had telemetry switching
-          return true;
-        }
-#endif
-      }
-
-      return false;
-    }
+    bool isSameInstance(TelemetryProtocol protocol, uint8_t instance);
   );
 });
 
diff --git a/radio/src/telemetry/telemetry_sensors.cpp b/radio/src/telemetry/telemetry_sensors.cpp
index 449879c5a..0896e1424 100644
--- a/radio/src/telemetry/telemetry_sensors.cpp
+++ b/radio/src/telemetry/telemetry_sensors.cpp
@@ -720,3 +720,23 @@ int32_t TelemetrySensor::getPrecDivisor() const
   if (prec == 1) return 10;
   return 1;
 }
+
+bool TelemetrySensor::isSameInstance(TelemetryProtocol protocol, uint8_t instance)
+{
+  if (this->instance == instance)
+    return true;
+
+  if (protocol == PROTOCOL_TELEMETRY_FRSKY_SPORT) {
+#if defined(SIMU)
+    if (((this->instance ^ instance) & 0x1F) == 0)
+      return true;
+#else
+    if (((this->instance ^ instance) & 0x9F) == 0 && (this->instance >> 5) != TELEMETRY_ENDPOINT_SPORT && (instance >> 5) != TELEMETRY_ENDPOINT_SPORT) {
+              this->instance = instance; // update the instance in case we had telemetry switching
+              return true;
+            }
+#endif
+  }
+
+  return false;
+}