diff --git a/unstable/fullscreen-shell/fullscreen-shell-unstable-v1.xml b/unstable/fullscreen-shell/fullscreen-shell-unstable-v1.xml
index 996ff930d51a6595f90fc2d50c6d7e3095032934..7d141ee3cbe59910df607eef43e737e2e24021ac 100644
--- a/unstable/fullscreen-shell/fullscreen-shell-unstable-v1.xml
+++ b/unstable/fullscreen-shell/fullscreen-shell-unstable-v1.xml
@@ -87,7 +87,7 @@
 	wl_display.sync request immediately after binding to ensure that they
 	receive all the capability events.
       </description>
-      <arg name="capabilty" type="uint"/>
+      <arg name="capability" type="uint"/>
     </event>
 
     <enum name="present_method">