diff --git a/openstack/compute/v2/extensions/defsecrules/requests.go b/openstack/compute/v2/extensions/defsecrules/requests.go
index 5e2d686..62c112e 100644
--- a/openstack/compute/v2/extensions/defsecrules/requests.go
+++ b/openstack/compute/v2/extensions/defsecrules/requests.go
@@ -7,24 +7,19 @@
 
 // List will return a collection of default rules.
 func List(client *gophercloud.ServiceClient) pagination.Pager {
-	createPage := func(r pagination.PageResult) pagination.Page {
+	return pagination.NewPager(client, rootURL(client), func(r pagination.PageResult) pagination.Page {
 		return DefaultRulePage{pagination.SinglePageBase(r)}
-	}
-
-	return pagination.NewPager(client, rootURL(client), createPage)
+	})
 }
 
 // CreateOpts represents the configuration for adding a new default rule.
 type CreateOpts struct {
-	// Required - the lower bound of the port range that will be opened.
-	FromPort int `json:"from_port"`
-
-	// Required - the upper bound of the port range that will be opened.
-	ToPort int `json:"to_port"`
-
-	// Required - the protocol type that will be allowed, e.g. TCP.
-	IPProtocol string `json:"ip_protocol"`
-
+	// The lower bound of the port range that will be opened.
+	FromPort int `json:"from_port" required:"true"`
+	// The upper bound of the port range that will be opened.
+	ToPort int `json:"to_port" required:"true"`
+	// The protocol type that will be allowed, e.g. TCP.
+	IPProtocol string `json:"ip_protocol" required:"true"`
 	// ONLY required if FromGroupID is blank. This represents the IP range that
 	// will be the source of network traffic to your security group. Use
 	// 0.0.0.0/0 to allow all IP addresses.
@@ -38,68 +33,33 @@
 
 // ToRuleCreateMap builds the create rule options into a serializable format.
 func (opts CreateOpts) ToRuleCreateMap() (map[string]interface{}, error) {
-	if opts.FromPort == 0 {
-		err := gophercloud.ErrMissingInput{}
-		err.Function = "defsecrules.ToRuleCreateMap"
-		err.Argument = "defsecrules.CreateOpts.FromPort"
-		return nil, err
-	}
-	if opts.ToPort == 0 {
-		err := gophercloud.ErrMissingInput{}
-		err.Function = "defsecrules.ToRuleCreateMap"
-		err.Argument = "defsecrules.CreateOpts.ToPort"
-		return nil, err
-	}
-	if opts.IPProtocol == "" {
-		err := gophercloud.ErrMissingInput{}
-		err.Function = "defsecrules.ToRuleCreateMap"
-		err.Argument = "defsecrules.CreateOpts.IPProtocol"
-		return nil, err
-	}
-	if opts.CIDR == "" {
-		err := gophercloud.ErrMissingInput{}
-		err.Function = "defsecrules.ToRuleCreateMap"
-		err.Argument = "defsecrules.CreateOpts.CIDR"
-		return nil, err
-	}
-
-	rule := make(map[string]interface{})
-
-	rule["from_port"] = opts.FromPort
-	rule["to_port"] = opts.ToPort
-	rule["ip_protocol"] = opts.IPProtocol
-	rule["cidr"] = opts.CIDR
-
-	return map[string]interface{}{"security_group_default_rule": rule}, nil
+	return gophercloud.BuildRequestBody(opts, "security_group_default_rule")
 }
 
 // Create is the operation responsible for creating a new default rule.
 func Create(client *gophercloud.ServiceClient, opts CreateOptsBuilder) CreateResult {
-	var result CreateResult
-
-	reqBody, err := opts.ToRuleCreateMap()
+	var r CreateResult
+	b, err := opts.ToRuleCreateMap()
 	if err != nil {
-		result.Err = err
-		return result
+		r.Err = err
+		return r
 	}
-
-	_, result.Err = client.Post(rootURL(client), reqBody, &result.Body, &gophercloud.RequestOpts{
+	_, r.Err = client.Post(rootURL(client), b, &r.Body, &gophercloud.RequestOpts{
 		OkCodes: []int{200},
 	})
-
-	return result
+	return r
 }
 
 // Get will return details for a particular default rule.
 func Get(client *gophercloud.ServiceClient, id string) GetResult {
-	var result GetResult
-	_, result.Err = client.Get(resourceURL(client, id), &result.Body, nil)
-	return result
+	var r GetResult
+	_, r.Err = client.Get(resourceURL(client, id), &r.Body, nil)
+	return r
 }
 
 // Delete will permanently delete a default rule from the project.
 func Delete(client *gophercloud.ServiceClient, id string) gophercloud.ErrResult {
-	var result gophercloud.ErrResult
-	_, result.Err = client.Delete(resourceURL(client, id), nil)
-	return result
+	var r gophercloud.ErrResult
+	_, r.Err = client.Delete(resourceURL(client, id), nil)
+	return r
 }