diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index 8a24314f8..a748ced3f 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -231,7 +231,11 @@
   #define IF_FAI_CHOICE(x)
 #endif
 
-#define IS_FAI_FORBIDDEN(idx) (IS_FAI_ENABLED() &&  isFaiForbidden(idx))
+#if defined(CPUARM)
+  #define IS_FAI_FORBIDDEN(idx) (IS_FAI_ENABLED() &&  isFaiForbidden(idx))
+#else
+  #define IS_FAI_FORBIDDEN(idx) (IS_FAI_ENABLED() && idx >= MIXSRC_FIRST_TELEM)
+#endif
 
 #if defined(BLUETOOTH)
 #if defined(X9E) && !defined(USEHORUSBT)