diff --git a/include/uapi/xen/gntdev.h b/include/uapi/xen/gntdev.h
index fe4423e518c6..9ac5515b9bc2 100644
--- a/include/uapi/xen/gntdev.h
+++ b/include/uapi/xen/gntdev.h
@@ -66,7 +66,7 @@ struct ioctl_gntdev_map_grant_ref {
 
 /*
  * Removes the grant references from the mapping table of an instance of
- * of gntdev. N.B. munmap() must be called on the relevant virtual address(es)
+ * gntdev. N.B. munmap() must be called on the relevant virtual address(es)
  * before this ioctl is called, or an error will result.
  */
 #define IOCTL_GNTDEV_UNMAP_GRANT_REF \