diff --git a/plugins/zfs/zpool_iostat b/plugins/zfs/zpool_iostat
index bfe29e30..1bd5e3dc 100755
--- a/plugins/zfs/zpool_iostat
+++ b/plugins/zfs/zpool_iostat
@@ -74,7 +74,7 @@ if [ "$ACTION" = "config" ]; then
         echo 'graph_title zpool iostat'
         echo 'graph_args --base 1000 -l 0'
         echo 'graph_vlabel write - read KBytes/s'
-        echo 'graph_category fs'
+        echo 'graph_category disk'
         echo 'graph_scale no'
         echo 'graph_info This graph shows zpool iostat'
 	# assemble the "graph_order" as a sorted list of read/write pairs for each poll