diff --git a/pkg/reconciler/revision/resources/deploy_test.go b/pkg/reconciler/revision/resources/deploy_test.go
index 64f6f8f62bd5..9479708fa054 100644
--- a/pkg/reconciler/revision/resources/deploy_test.go
+++ b/pkg/reconciler/revision/resources/deploy_test.go
@@ -612,7 +612,7 @@ func TestMakePodSpec(t *testing.T) {
 					withExecReadinessProbe([]string{"echo", "hello"})),
 				queueContainer(
 					withEnvVar("CONTAINER_CONCURRENCY", "0"),
-					withEnvVar("SERVING_READINESS_PROBE", "{}"),
+					withEnvVar("SERVING_READINESS_PROBE", `{"tcpSocket":{"port":8080,"host":"127.0.0.1"}}`),
 				),
 			}),
 	}, {
diff --git a/pkg/reconciler/revision/resources/queue.go b/pkg/reconciler/revision/resources/queue.go
index 028f781fe03b..8e1df78374cc 100644
--- a/pkg/reconciler/revision/resources/queue.go
+++ b/pkg/reconciler/revision/resources/queue.go
@@ -356,7 +356,12 @@ func applyReadinessProbeDefaults(p *corev1.Probe, port int32) {
 		p.TCPSocket.Host = localAddress
 		p.TCPSocket.Port = intstr.FromInt(int(port))
 	case p.Exec != nil:
-		//User-defined ExecProbe will still be run on user-container.
+		// User-defined ExecProbe will still be run on user-container.
+		// Use TCP probe in queue-proxy.
+		p.TCPSocket = &corev1.TCPSocketAction{
+			Host: localAddress,
+			Port: intstr.FromInt(int(port)),
+		}
 		p.Exec = nil
 	}
 
diff --git a/test/conformance/runtime/readiness_probe_test.go b/test/conformance/runtime/readiness_probe_test.go
index 2daffb5ae309..a2bf1246f44a 100644
--- a/test/conformance/runtime/readiness_probe_test.go
+++ b/test/conformance/runtime/readiness_probe_test.go
@@ -31,37 +31,65 @@ import (
 )
 
 func TestProbeRuntime(t *testing.T) {
-	t.Parallel()
 	cancel := logstream.Start(t)
 	defer cancel()
 
 	clients := test.Setup(t)
 
-	names := test.ResourceNames{
-		Service: test.ObjectNameForTest(t),
-		Image:   "runtime",
-	}
+	var testCases = []struct {
+		// name of the test case, which will be inserted in names of routes, configurations, etc.
+		// Use a short name here to avoid hitting the 63-character limit in names
+		// (e.g., "service-to-service-call-svc-cluster-local-uagkdshh-frkml-service" is too long.)
+		name string
+		// handler to be used for readiness probe in user container.
+		handler corev1.Handler
+	}{{
+		"httpGet",
+		corev1.Handler{
+			HTTPGet: &corev1.HTTPGetAction{
+				Path: "/healthz",
+			},
+		},
+	}, {
+		"tcpSocket",
+		corev1.Handler{
+			TCPSocket: &corev1.TCPSocketAction{},
+		},
+	}, {
+		"exec",
+		corev1.Handler{
+			Exec: &corev1.ExecAction{
+				Command: []string{"/ko-app/runtime", "probe"},
+			},
+		},
+	}}
 
-	test.CleanupOnInterrupt(func() { test.TearDown(clients, names) })
-	defer test.TearDown(clients, names)
+	for _, tc := range testCases {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			names := test.ResourceNames{
+				Service: test.ObjectNameForTest(t),
+				Image:   test.Runtime,
+			}
 
-	t.Log("Creating a new Service")
-	resources, _, err := v1a1test.CreateRunLatestServiceReady(t, clients, &names,
-		false, /* https TODO(taragu) turn this on after helloworld test running with https */
-		v1a1opts.WithReadinessProbe(
-			&corev1.Probe{
-				Handler: corev1.Handler{
-					HTTPGet: &corev1.HTTPGetAction{
-						Path: "/healthz",
-					},
-				},
-			}))
-	if err != nil {
-		t.Fatalf("Failed to create initial Service: %v: %v", names.Service, err)
-	}
+			test.CleanupOnInterrupt(func() { test.TearDown(clients, names) })
+			defer test.TearDown(clients, names)
 
-	// Check if scaling down works even if access from liveness probe exists.
-	if err := e2e.WaitForScaleToZero(t, revisionresourcenames.Deployment(resources.Revision), clients); err != nil {
-		t.Fatalf("Could not scale to zero: %v", err)
+			t.Log("Creating a new Service")
+			resources, _, err := v1a1test.CreateRunLatestServiceReady(t, clients, &names,
+				false, /* https TODO(taragu) turn this on after helloworld test running with https */
+				v1a1opts.WithReadinessProbe(
+					&corev1.Probe{
+						Handler: tc.handler,
+					}))
+			if err != nil {
+				t.Fatalf("Failed to create initial Service: %v: %v", names.Service, err)
+			}
+			// Check if scaling down works even if access from liveness probe exists.
+			if err := e2e.WaitForScaleToZero(t, revisionresourcenames.Deployment(resources.Revision), clients); err != nil {
+				t.Fatalf("Could not scale to zero: %v", err)
+			}
+		})
 	}
 }
diff --git a/test/test_images/runtime/main.go b/test/test_images/runtime/main.go
index 36387fdbb1cd..d231e82a737d 100644
--- a/test/test_images/runtime/main.go
+++ b/test/test_images/runtime/main.go
@@ -14,6 +14,7 @@ limitations under the License.
 package main
 
 import (
+	"flag"
 	"log"
 	"net/http"
 	"os"
@@ -23,7 +24,6 @@ import (
 )
 
 func main() {
-
 	// We expect PORT to be defined in a Knative environment
 	// and don't want to mask this failure in a test image.
 	port, isSet := os.LookupEnv("PORT")
@@ -31,6 +31,17 @@ func main() {
 		log.Fatal("Environment variable PORT is not set.")
 	}
 
+	// This is an option for exec readiness probe test.
+	flag.Parse()
+	args := flag.Args()
+	if len(args) > 0 && args[0] == "probe" {
+		url := "http://localhost:" + port
+		if _, err := http.Get(url); err != nil {
+			log.Fatalf("Failed to probe %v", err)
+		}
+		return
+	}
+
 	mux := http.NewServeMux()
 	handlers.InitHandlers(mux)