diff --git a/radio/src/sbus.cpp b/radio/src/sbus.cpp
index 16f9fd50f..ca2fdafa6 100644
--- a/radio/src/sbus.cpp
+++ b/radio/src/sbus.cpp
@@ -69,9 +69,8 @@ void processSbusFrame(uint8_t *sbus, int16_t *pulses, uint32_t size)
     return;
   }
 
-  if (size > SBUS_FLAGS_IDX &&
-      (sbus[SBUS_FLAGS_IDX-1] & (1<<SBUS_FAILSAFE_BIT))) {
-    return; // SBUS failsafe mode
+  if (size > SBUS_FLAGS_IDX && ((sbus[SBUS_FLAGS_IDX] & (1<<SBUS_FAILSAFE_BIT)) || (sbus[SBUS_FLAGS_IDX] & (1<<SBUS_FRAMELOST_BIT)))) {
+    return; // SBUS invalid frame or failsafe mode
   }
 
   // Skip start byte