diff --git a/cmd/prometheus/main_test.go b/cmd/prometheus/main_test.go
index 26d11e21e..21447d036 100644
--- a/cmd/prometheus/main_test.go
+++ b/cmd/prometheus/main_test.go
@@ -121,7 +121,7 @@ func TestFailedStartupExitCode(t *testing.T) {
 	fakeInputFile := "fake-input-file"
 	expectedExitStatus := 2
 
-	prom := exec.Command(promPath, "-test.main", "--config.file="+fakeInputFile)
+	prom := exec.Command(promPath, "-test.main", "--web.listen-address=0.0.0.0:0", "--config.file="+fakeInputFile)
 	err := prom.Run()
 	require.Error(t, err)
 
@@ -358,7 +358,7 @@ func getCurrentGaugeValuesFor(t *testing.T, reg prometheus.Gatherer, metricNames
 }
 
 func TestAgentSuccessfulStartup(t *testing.T) {
-	prom := exec.Command(promPath, "-test.main", "--enable-feature=agent", "--config.file="+agentConfig)
+	prom := exec.Command(promPath, "-test.main", "--enable-feature=agent", "--web.listen-address=0.0.0.0:0", "--config.file="+agentConfig)
 	require.NoError(t, prom.Start())
 
 	actualExitStatus := 0
@@ -376,7 +376,7 @@ func TestAgentSuccessfulStartup(t *testing.T) {
 }
 
 func TestAgentFailedStartupWithServerFlag(t *testing.T) {
-	prom := exec.Command(promPath, "-test.main", "--enable-feature=agent", "--storage.tsdb.path=.", "--config.file="+promConfig)
+	prom := exec.Command(promPath, "-test.main", "--enable-feature=agent", "--storage.tsdb.path=.", "--web.listen-address=0.0.0.0:0", "--config.file="+promConfig)
 
 	output := bytes.Buffer{}
 	prom.Stderr = &output
@@ -403,7 +403,7 @@ func TestAgentFailedStartupWithServerFlag(t *testing.T) {
 }
 
 func TestAgentFailedStartupWithInvalidConfig(t *testing.T) {
-	prom := exec.Command(promPath, "-test.main", "--enable-feature=agent", "--config.file="+promConfig)
+	prom := exec.Command(promPath, "-test.main", "--enable-feature=agent", "--web.listen-address=0.0.0.0:0", "--config.file="+promConfig)
 	require.NoError(t, prom.Start())
 
 	actualExitStatus := 0
@@ -438,7 +438,7 @@ func TestModeSpecificFlags(t *testing.T) {
 
 	for _, tc := range testcases {
 		t.Run(fmt.Sprintf("%s mode with option %s", tc.mode, tc.arg), func(t *testing.T) {
-			args := []string{"-test.main", tc.arg, t.TempDir()}
+			args := []string{"-test.main", tc.arg, t.TempDir(), "--web.listen-address=0.0.0.0:0"}
 
 			if tc.mode == "agent" {
 				args = append(args, "--enable-feature=agent", "--config.file="+agentConfig)