diff --git a/sw/airborne/subsystems/datalink/downlink.h b/sw/airborne/subsystems/datalink/downlink.h
index 3444c401fa..333ecb6dfc 100644
--- a/sw/airborne/subsystems/datalink/downlink.h
+++ b/sw/airborne/subsystems/datalink/downlink.h
@@ -85,7 +85,7 @@
 
 /** Downlink structure */
 struct downlink {
-  uint8_t nb_ovrn;    ///< Counter of messages not sent because of unavailibity of the output buffer
+  uint8_t nb_ovrn;    ///< Counter of messages not sent because of unavailability of the output buffer
   uint16_t nb_bytes;  ///< Number of bytes send over telemetry
   uint16_t nb_msgs;   ///< Number of messages send over telemetry
 };