diff --git a/src/drivers/drv_rc_input.h b/src/drivers/drv_rc_input.h
index 03f1dfbe58..6b87141e9d 100644
--- a/src/drivers/drv_rc_input.h
+++ b/src/drivers/drv_rc_input.h
@@ -60,7 +60,7 @@
 /**
  * Maximum number of R/C input channels in the system. S.Bus has up to 18 channels.
  */
-#define RC_INPUT_MAX_CHANNELS	20
+#define RC_INPUT_MAX_CHANNELS	18
 
 /**
  * Input signal type, value is a control position from zero to 100