diff --git a/sbin/fsck_ffs/preen.c b/sbin/fsck_ffs/preen.c
index aee801e78e2c..62dc3d8e1acc 100644
--- a/sbin/fsck_ffs/preen.c
+++ b/sbin/fsck_ffs/preen.c
@@ -57,7 +57,7 @@ struct part {
 	struct	part *next;		/* forward link of partitions on disk */
 	char	*name;			/* device name */
 	char	*fsname;		/* mounted filesystem name */
-	long	auxdata;		/* auxillary data for application */
+	long	auxdata;		/* auxiliary data for application */
 } *badlist, **badnext = &badlist;
 
 struct disk {
diff --git a/sbin/fsck_ifs/preen.c b/sbin/fsck_ifs/preen.c
index 4ad426f9edb4..3e073c6c96f6 100644
--- a/sbin/fsck_ifs/preen.c
+++ b/sbin/fsck_ifs/preen.c
@@ -56,7 +56,7 @@ struct part {
 	struct	part *next;		/* forward link of partitions on disk */
 	char	*name;			/* device name */
 	char	*fsname;		/* mounted filesystem name */
-	long	auxdata;		/* auxillary data for application */
+	long	auxdata;		/* auxiliary data for application */
 } *badlist, **badnext = &badlist;
 
 struct disk {
diff --git a/sbin/quotacheck/preen.c b/sbin/quotacheck/preen.c
index aee801e78e2c..62dc3d8e1acc 100644
--- a/sbin/quotacheck/preen.c
+++ b/sbin/quotacheck/preen.c
@@ -57,7 +57,7 @@ struct part {
 	struct	part *next;		/* forward link of partitions on disk */
 	char	*name;			/* device name */
 	char	*fsname;		/* mounted filesystem name */
-	long	auxdata;		/* auxillary data for application */
+	long	auxdata;		/* auxiliary data for application */
 } *badlist, **badnext = &badlist;
 
 struct disk {