diff --git a/internal/services/appservice/helpers/linux_web_app_schema.go b/internal/services/appservice/helpers/linux_web_app_schema.go
index 522ee3609d829..52c88ccfd8ef5 100644
--- a/internal/services/appservice/helpers/linux_web_app_schema.go
+++ b/internal/services/appservice/helpers/linux_web_app_schema.go
@@ -1018,6 +1018,7 @@ func (s *SiteConfigLinux) ExpandForCreate(appSettings map[string]string) (*webap
 func (s *SiteConfigLinux) ExpandForUpdate(metadata sdk.ResourceMetaData, existing *webapps.SiteConfig, appSettings map[string]string) (*webapps.SiteConfig, error) {
 	expanded := *existing
 
+	expanded.AlwaysOn = pointer.To(s.AlwaysOn)
 	expanded.AcrUseManagedIdentityCreds = pointer.To(s.UseManagedIdentityACR)
 	expanded.AutoHealEnabled = pointer.To(s.AutoHeal)
 	expanded.HTTP20Enabled = pointer.To(s.Http2Enabled)
diff --git a/internal/services/appservice/helpers/web_app_slot_schema.go b/internal/services/appservice/helpers/web_app_slot_schema.go
index e9e44c9a10e84..56e7bc291fc02 100644
--- a/internal/services/appservice/helpers/web_app_slot_schema.go
+++ b/internal/services/appservice/helpers/web_app_slot_schema.go
@@ -707,6 +707,7 @@ func (s *SiteConfigLinuxWebAppSlot) ExpandForCreate(appSettings map[string]strin
 func (s *SiteConfigLinuxWebAppSlot) ExpandForUpdate(metadata sdk.ResourceMetaData, existing *webapps.SiteConfig, appSettings map[string]string) (*webapps.SiteConfig, error) {
 	expanded := *existing
 
+	expanded.AlwaysOn = pointer.To(s.AlwaysOn)
 	expanded.AcrUseManagedIdentityCreds = pointer.To(s.UseManagedIdentityACR)
 	expanded.AutoHealEnabled = pointer.To(s.AutoHeal)
 	expanded.HTTP20Enabled = pointer.To(s.Http2Enabled)
diff --git a/internal/services/appservice/linux_web_app_resource_test.go b/internal/services/appservice/linux_web_app_resource_test.go
index 5a0b169cc108a..7fc0662d2bd86 100644
--- a/internal/services/appservice/linux_web_app_resource_test.go
+++ b/internal/services/appservice/linux_web_app_resource_test.go
@@ -124,6 +124,7 @@ func TestAccLinuxWebApp_completeUpdated(t *testing.T) {
 			Config: r.complete(data),
 			Check: acceptance.ComposeTestCheckFunc(
 				check.That(data.ResourceName).ExistsInAzure(r),
+				check.That(data.ResourceName).Key("site_config.0.always_on").HasValue("true"),
 			),
 		},
 		data.ImportStep("site_credential.0.password"),
diff --git a/internal/services/appservice/linux_web_app_slot_resource_test.go b/internal/services/appservice/linux_web_app_slot_resource_test.go
index 7e175aa3d8c54..dc19153ea96c9 100644
--- a/internal/services/appservice/linux_web_app_slot_resource_test.go
+++ b/internal/services/appservice/linux_web_app_slot_resource_test.go
@@ -182,6 +182,7 @@ func TestAccLinuxWebAppSlot_completeUpdate(t *testing.T) {
 			Config: r.complete(data),
 			Check: acceptance.ComposeTestCheckFunc(
 				check.That(data.ResourceName).ExistsInAzure(r),
+				check.That(data.ResourceName).Key("site_config.0.always_on").HasValue("true"),
 			),
 		},
 		data.ImportStep("site_credential.0.password"),