diff --git a/libraries/AP_Common/AP_Common.h b/libraries/AP_Common/AP_Common.h
index c8dfb5e0af..a1f3a6b2b9 100644
--- a/libraries/AP_Common/AP_Common.h
+++ b/libraries/AP_Common/AP_Common.h
@@ -119,7 +119,7 @@ char (&_ARRAY_SIZE_HELPER(T (&_arr)[0]))[0];
 //@{
 
 struct PACKED Location_Option_Flags {
-    uint8_t relative_alt : 1;           // 1 if altitude is relateive to home
+    uint8_t relative_alt : 1;           // 1 if altitude is relative to home
     uint8_t unused1      : 1;           // unused flag (defined so that loiter_ccw uses the correct bit)
     uint8_t loiter_ccw   : 1;           // 0 if clockwise, 1 if counter clockwise
     uint8_t terrain_alt  : 1;           // this altitude is above terrain