diff --git a/src/syslinux/libinstaller/setadv.c b/src/syslinux/libinstaller/setadv.c
index 838678bd..66601f7c 100644
--- a/src/syslinux/libinstaller/setadv.c
+++ b/src/syslinux/libinstaller/setadv.c
@@ -14,7 +14,7 @@
 /*
  * setadv.c
  *
- * (Over)write a data item in the auxilliary data vector.  To
+ * (Over)write a data item in the auxiliary data vector.  To
  * delete an item, set its length to zero.
  *
  * Return 0 on success, -1 on error, and set errno.