diff --git a/tests/run-multitests.py b/tests/run-multitests.py
index 3817fbed7..2fd766563 100755
--- a/tests/run-multitests.py
+++ b/tests/run-multitests.py
@@ -403,6 +403,10 @@ def main():
     for i in cmd_args.instance:
         if i.startswith("exec:"):
             instances_test.append(PyInstanceSubProcess([i[len("exec:") :]]))
+        elif i == "micropython":
+            instances_test.append(PyInstanceSubProcess([MICROPYTHON]))
+        elif i == "cpython":
+            instances_test.append(PyInstanceSubProcess([CPYTHON3]))
         elif i.startswith("pyb:"):
             instances_test.append(PyInstancePyboard(i[len("pyb:") :]))
         else: