diff --git a/util/test/rdtest/runner.py b/util/test/rdtest/runner.py
index a6d6665dd..b9f398e3b 100644
--- a/util/test/rdtest/runner.py
+++ b/util/test/rdtest/runner.py
@@ -21,7 +21,7 @@ def get_tests():
     for m in sys.modules.values():
         for name in m.__dict__:
             obj = m.__dict__[name]
-            if isinstance(obj, type) and issubclass(obj, testcase.TestCase) and obj != testcase.TestCase:
+            if isinstance(obj, type) and issubclass(obj, testcase.TestCase) and obj != testcase.TestCase and not obj.internal:
                 testcases.append(obj)
 
     testcases.sort(key=lambda t: (t.slow_test,t.__name__))
diff --git a/util/test/rdtest/testcase.py b/util/test/rdtest/testcase.py
index 4333e929f..e4e3dd1b5 100644
--- a/util/test/rdtest/testcase.py
+++ b/util/test/rdtest/testcase.py
@@ -128,6 +128,7 @@ class ConstantBufferChecker:
 
 class TestCase:
     slow_test = False
+    internal = False
     demos_test_name = ''
     demos_frame_cap = 5
     _test_list = {}