diff --git a/tests/test_vms_exist.py b/tests/test_vms_exist.py
index 558f122b..8bc0c20c 100644
--- a/tests/test_vms_exist.py
+++ b/tests/test_vms_exist.py
@@ -12,6 +12,9 @@
 )
 from qubesadmin import Qubes
 
+with open("config.json") as f:
+    CONFIG = json.load(f)
+
 
 class SD_VM_Tests(unittest.TestCase):
     def setUp(self):
@@ -29,6 +32,16 @@ def test_expected(self):
         expected_vms = set(SD_VMS + SD_DVM_TEMPLATES + SD_TEMPLATES)
         self.assertEqual(set(sdw_tagged_vm_names), set(expected_vms))
 
+    @unittest.skipIf(CONFIG["environment"] != "prod", "Skipping on non-prod system")
+    def test_internal(self):
+        not_internal = ["sd-proxy", "sd-whonix", "sd-devices"]
+
+        for vm_name in SD_VMS:
+            if vm_name in not_internal:
+                continue
+            vm = self.app.domains[vm_name]
+            self.assertEqual(vm.features.get("internal"), "1")
+
     def test_grsec_kernel(self):
         """
         Confirms expected grsecurity-patched kernel is running.