diff --git a/sys/dev/ciss/cissreg.h b/sys/dev/ciss/cissreg.h
index 9e7434b74291..14cc8d7abf96 100644
--- a/sys/dev/ciss/cissreg.h
+++ b/sys/dev/ciss/cissreg.h
@@ -691,7 +691,7 @@ struct ciss_bmic_id_table {
 /*
  * Below here I have no documentation on the rest of this data structure.  It is
  * inferred from the opensource cciss_vol_status application.  I assume that this 
- * data strucutre is 512 bytes in total size, do not exceed it.
+ * data structure is 512 bytes in total size, do not exceed it.
  */
     u_int8_t	bDdffVersion[4];         /* DDFF update engine version          */
     u_int16_t	usMaxLogicalUnits;       /* Maximum logical units supported */