diff --git a/main.py b/main.py
index 6f6156f..08d0189 100644
--- a/main.py
+++ b/main.py
@@ -90,6 +90,10 @@
                     test_status
                 ), f"Test {test["test_name"]} does not end with {test_status}"
 
+# Ensure the results are JSON serializable.
+import json
+check = json.dumps(actual_results)
+
 # Create a div to display the results in the page.
 page.append(
     div(
diff --git a/upytest.py b/upytest.py
index 10ed88f..b0d60ec 100644
--- a/upytest.py
+++ b/upytest.py
@@ -130,7 +130,7 @@ def __init__(self, test_function, module_name, test_name, function_id):
         and the unique Python id of the test function.
         """
         self.test_function = test_function
-        self.module_name = module_name
+        self.module_name = str(module_name)
         self.test_name = test_name
         self.function_id = function_id
         self.status = PENDING  # the initial state of the test.