diff --git a/uncloud/uncloud_vm/models.py b/uncloud/uncloud_vm/models.py
index e54c4ea..4b0d511 100644
--- a/uncloud/uncloud_vm/models.py
+++ b/uncloud/uncloud_vm/models.py
@@ -35,15 +35,15 @@ class VMHost(models.Model):
     # ram that can be used of the server
     usable_ram_in_gb = models.FloatField(default=0)
 
-    status = models.CharField(max_length=32, choices=STATUS_CHOICES, default=STATUS_DEFAULT)
+    status = models.CharField(
+        max_length=32, choices=STATUS_CHOICES, default=STATUS_DEFAULT
+    )
 
 
 class VMProduct(Product):
-    vmhost   = models.ForeignKey(VMHost,
-                                 on_delete=models.CASCADE,
-                                 editable=False,
-                                 blank=True,
-                                 null=True)
+    vmhost = models.ForeignKey(
+        VMHost, on_delete=models.CASCADE, editable=False, blank=True, null=True
+    )
 
     cores = models.IntegerField()
     ram_in_gb = models.FloatField()