diff --git a/rackspace/autoscale/v1/webhooks/requests.go b/rackspace/autoscale/v1/webhooks/requests.go
index bfdb01a..2a88959 100644
--- a/rackspace/autoscale/v1/webhooks/requests.go
+++ b/rackspace/autoscale/v1/webhooks/requests.go
@@ -7,9 +7,11 @@
 	"github.com/rackspace/gophercloud/pagination"
 )
 
-// ErrNoName represents a validation error in which a create or update operation
-// has an empty name field.
-var ErrNoName = errors.New("Webhook name cannot by empty.")
+// Validation errors returned by create or update operations.
+var (
+	ErrNoName     = errors.New("Webhook name cannot by empty.")
+	ErrNoMetadata = errors.New("Webhook metadata cannot be nil.")
+)
 
 // List returns all webhooks for a scaling policy.
 func List(client *gophercloud.ServiceClient, groupID, policyID string) pagination.Pager {
@@ -118,13 +120,14 @@
 		return nil, ErrNoName
 	}
 
+	if opts.Metadata == nil {
+		return nil, ErrNoMetadata
+	}
+
 	hook := make(map[string]interface{})
 
 	hook["name"] = opts.Name
-
-	if opts.Metadata != nil {
-		hook["metadata"] = opts.Metadata
-	}
+	hook["metadata"] = opts.Metadata
 
 	return hook, nil
 }