diff --git a/coreos.json b/coreos.json
index d34600d..cbcf98c 100644
--- a/coreos.json
+++ b/coreos.json
@@ -23,6 +23,12 @@
       {
         "device": "/dev/sda",
         "partitions": [
+          {
+            "label": "root",
+            "number": 4,
+            "resize": true,
+            "sizeMiB": 0
+          },
           {
             "label": "swap",
             "number": 5,
@@ -84,6 +90,11 @@
       }
     ],
     "filesystems": [
+      {
+        "device": "/dev/disk/by-partlabel/root",
+        "format": "xfs",
+        "label": "root"
+      },
       {
         "device": "/dev/disk/by-partlabel/swap",
         "format": "swap"