diff --git a/pkg/functions/function.go b/pkg/functions/function.go
index 09d2506273..429128f53b 100644
--- a/pkg/functions/function.go
+++ b/pkg/functions/function.go
@@ -227,6 +227,12 @@ type DeploySpec struct {
 	// Defaults to "knative" for backwards compatibility
 	Deployer string `yaml:"deployer,omitempty" jsonschema:"enum=knative,enum=raw,enum=keda"`
 
+	// ClusterDomain specifies the cluster domain used for building internal service URLs.
+	// Defaults to "cluster.local" if not specified.
+	// This is particularly useful for KEDA deployments where the interceptor proxy
+	// service URL needs to match the cluster's actual domain configuration.
+	ClusterDomain string `yaml:"clusterDomain,omitempty"`
+
 	Subscriptions []KnativeSubscription `yaml:"subscriptions,omitempty"`
 }
 
diff --git a/pkg/keda/deployer.go b/pkg/keda/deployer.go
index 17300bfda1..f97be194d8 100644
--- a/pkg/keda/deployer.go
+++ b/pkg/keda/deployer.go
@@ -204,6 +204,14 @@ func (d *Deployer) interceptorBridgeServiceName(f fn.Function) string {
 }
 
 func (d *Deployer) interceptorBridgeService(f fn.Function, namespace string, deployment *v1.Deployment) *corev1.Service {
+	// Use configured cluster domain, default to "cluster.local"
+	clusterDomain := f.Deploy.ClusterDomain
+	if clusterDomain == "" {
+		clusterDomain = "cluster.local"
+	}
+
+	externalName := fmt.Sprintf("keda-add-ons-http-interceptor-proxy.keda.svc.%s", clusterDomain)
+
 	return &corev1.Service{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      d.interceptorBridgeServiceName(f),
@@ -220,7 +228,7 @@ func (d *Deployer) interceptorBridgeService(f fn.Function, namespace string, dep
 		},
 		Spec: corev1.ServiceSpec{
 			Type:         corev1.ServiceTypeExternalName,
-			ExternalName: "keda-add-ons-http-interceptor-proxy.keda.svc.cluster.local",
+			ExternalName: externalName,
 		},
 	}
 }
diff --git a/pkg/keda/deployer_test.go b/pkg/keda/deployer_test.go
new file mode 100644
index 0000000000..4e00bec296
--- /dev/null
+++ b/pkg/keda/deployer_test.go
@@ -0,0 +1,86 @@
+package keda
+
+import (
+	"testing"
+
+	v1 "k8s.io/api/apps/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	fn "knative.dev/func/pkg/functions"
+)
+
+func TestDeployer_interceptorBridgeService(t *testing.T) {
+	tests := []struct {
+		name                 string
+		function             fn.Function
+		expectedExternalName string
+	}{
+		{
+			name: "uses default cluster.local when ClusterDomain is empty",
+			function: fn.Function{
+				Name: "test-func",
+				Deploy: fn.DeploySpec{
+					ClusterDomain: "",
+				},
+			},
+			expectedExternalName: "keda-add-ons-http-interceptor-proxy.keda.svc.cluster.local",
+		},
+		{
+			name: "uses custom cluster domain when specified",
+			function: fn.Function{
+				Name: "test-func",
+				Deploy: fn.DeploySpec{
+					ClusterDomain: "custom.domain",
+				},
+			},
+			expectedExternalName: "keda-add-ons-http-interceptor-proxy.keda.svc.custom.domain",
+		},
+		{
+			name: "uses cluster.local explicitly when specified",
+			function: fn.Function{
+				Name: "test-func",
+				Deploy: fn.DeploySpec{
+					ClusterDomain: "cluster.local",
+				},
+			},
+			expectedExternalName: "keda-add-ons-http-interceptor-proxy.keda.svc.cluster.local",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			d := NewDeployer()
+			deployment := &v1.Deployment{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: tt.function.Name,
+					UID:  "test-uid",
+				},
+			}
+
+			service := d.interceptorBridgeService(tt.function, "test-namespace", deployment)
+
+			if service.Spec.ExternalName != tt.expectedExternalName {
+				t.Errorf("interceptorBridgeService() ExternalName = %v, want %v",
+					service.Spec.ExternalName, tt.expectedExternalName)
+			}
+
+			// Verify service name
+			expectedServiceName := d.interceptorBridgeServiceName(tt.function)
+			if service.Name != expectedServiceName {
+				t.Errorf("interceptorBridgeService() Name = %v, want %v",
+					service.Name, expectedServiceName)
+			}
+
+			// Verify namespace
+			if service.Namespace != "test-namespace" {
+				t.Errorf("interceptorBridgeService() Namespace = %v, want %v",
+					service.Namespace, "test-namespace")
+			}
+
+			// Verify service type
+			if service.Spec.Type != "ExternalName" {
+				t.Errorf("interceptorBridgeService() Type = %v, want %v",
+					service.Spec.Type, "ExternalName")
+			}
+		})
+	}
+}