diff --git a/acceptance/openstack/waf-premium/v1/policy_test.go b/acceptance/openstack/waf-premium/v1/policy_test.go
index 207fc14d2..b79b09a9d 100644
--- a/acceptance/openstack/waf-premium/v1/policy_test.go
+++ b/acceptance/openstack/waf-premium/v1/policy_test.go
@@ -97,6 +97,9 @@ func TestWafPremiumPolicyWorkflow(t *testing.T) {
 		},
 		Level:         1,
 		FullDetection: pointerto.Bool(true),
+		Extend: &policies.ExtendParams{
+			Extend: "{\"deep_decode\":false,\"check_all_headers\":true,\"shiro_rememberMe_enable\":false}",
+		},
 	}
 	updated, err := policies.Update(client, policy.ID, updateOpts)
 	th.AssertNoErr(t, err)
@@ -104,4 +107,5 @@ func TestWafPremiumPolicyWorkflow(t *testing.T) {
 	th.AssertEquals(t, *updated.FullDetection, true)
 	th.AssertEquals(t, updated.Action.Category, "block")
 	th.AssertEquals(t, *updated.Options.WebAttack, false)
+	th.AssertEquals(t, updated.Extend.Extend, "{\"deep_decode\":false,\"check_all_headers\":true,\"shiro_rememberMe_enable\":false}")
 }
diff --git a/openstack/waf-premium/v1/policies/Update.go b/openstack/waf-premium/v1/policies/Update.go
index 5050e7a01..4430e094b 100644
--- a/openstack/waf-premium/v1/policies/Update.go
+++ b/openstack/waf-premium/v1/policies/Update.go
@@ -19,7 +19,12 @@ type UpdateOpts struct {
 	// Protection level
 	Level int `json:"level"`
 	// Detection mode in the precise protection rule
-	FullDetection *bool `json:"full_detection"`
+	FullDetection *bool         `json:"full_detection"`
+	Extend        *ExtendParams `json:"extend,omitempty"`
+}
+
+type ExtendParams struct {
+	Extend string `json:"extend"`
 }
 
 func Update(client *golangsdk.ServiceClient, id string, opts UpdateOpts) (*Policy, error) {