diff --git a/.github/workflows/kind-e2e.yaml b/.github/workflows/kind-e2e.yaml
index b64a415fa558..be33cdc9a59b 100644
--- a/.github/workflows/kind-e2e.yaml
+++ b/.github/workflows/kind-e2e.yaml
@@ -91,7 +91,7 @@ jobs:
         - kourier
         - kourier-tls
         - istio
-        # - istio-tls
+        - istio-tls
         # Disabled due to flakiness: https://github.com/knative/serving/issues/14637
         # - istio-ambient
         - contour
@@ -116,10 +116,10 @@ jobs:
         - ingress: istio
           namespace-resources: virtualservices
 
-        # - ingress: istio-tls
-        #   ingress-class: istio
-        #   namespace-resources: virtualservices
-        #   enable-tls: 1
+        - ingress: istio-tls
+          ingress-class: istio
+          namespace-resources: virtualservices
+          enable-tls: 1
 
         # Disabled due to flakiness: https://github.com/knative/serving/issues/14637
         # - ingress: istio-ambient
diff --git a/test/e2e/systeminternaltls/system_internal_tls_test.go b/test/e2e/systeminternaltls/system_internal_tls_test.go
index 1e9739d2b8e5..5012e0cd223a 100644
--- a/test/e2e/systeminternaltls/system_internal_tls_test.go
+++ b/test/e2e/systeminternaltls/system_internal_tls_test.go
@@ -44,8 +44,9 @@ func TestSystemInternalTLS(t *testing.T) {
 		t.Skip("Alpha features not enabled")
 	}
 
-	if !strings.Contains(test.ServingFlags.IngressClass, "kourier") {
-		t.Skip("Skip this test for non-kourier ingress.")
+	if !(strings.Contains(test.ServingFlags.IngressClass, "kourier") ||
+		strings.Contains(test.ServingFlags.IngressClass, "istio")) {
+		t.Skip("Skip this test for non-kourier or non-istio ingress.")
 	}
 
 	t.Parallel()