diff --git a/sys/dev/ciss/cissreg.h b/sys/dev/ciss/cissreg.h
index b9dc10fbf47..9e7434b7429 100644
--- a/sys/dev/ciss/cissreg.h
+++ b/sys/dev/ciss/cissreg.h
@@ -684,7 +684,7 @@ struct ciss_bmic_id_table {
     u_int8_t	percent_write_cache;     /* Percent of memory allocated to write cache */
     u_int16_t	daughterboard_size_mb;   /* Total size (MB) of cache board      */
     u_int8_t	cache_batter_count;      /* Number of cache batteries           */
-    u_int16_t	total_controller_mem_mb; /* Total size (MB) of atttached memory */
+    u_int16_t	total_controller_mem_mb; /* Total size (MB) of attached memory  */
     u_int8_t	more_controller_flags;   /* Additional controller flags byte    */
     u_int8_t	x_board_host_i2c_rev;    /* 2nd byte of 3 byte autorev field    */
     u_int8_t	battery_pic_rev;         /* BBWC PIC revision                   */