diff --git a/test/e2e/systeminternaltls/system_internal_tls_test.go b/test/e2e/systeminternaltls/system_internal_tls_test.go
index fbf16b7ff73e..30bfbec1f167 100644
--- a/test/e2e/systeminternaltls/system_internal_tls_test.go
+++ b/test/e2e/systeminternaltls/system_internal_tls_test.go
@@ -122,8 +122,6 @@ func TestTLSCertificateRotation(t *testing.T) {
 		t.Skip("Skip this test for non-kourier or non-istio ingress.")
 	}
 
-	t.Parallel()
-
 	clients := test.Setup(t)
 
 	names := test.ResourceNames{