diff --git a/tests/framework/report.py b/tests/framework/report.py
index a80a900615f..fafd3cdb642 100644
--- a/tests/framework/report.py
+++ b/tests/framework/report.py
@@ -227,24 +227,17 @@ def add_collected_items(self, items):
         for item in items:
             self._collected_items[item.nodeid] = Report.TestItem(item)
 
-    def catch_return(self, item):
+    @mpsing.ipcmethod
+    def set_return(self, nodeid, rval):
         """
-        Wrap around a pytest test function.
+        Set return value for a given test.
 
-        We do this because we want to somehow catch the return value of
-        functions to set expected test criteria and actual criteria.
+        This function is called over IPC and needs picklable
+        objects as params.
         """
-        # Save the original function
-        original_function = item.obj
-
-        def func_wrapper(*args, **kwargs):
-            # Set the return value of this test item as the return value
-            # of the function
-            self._collected_items[item.nodeid].set_return(
-                original_function(*args, **kwargs))
-
-        item.obj = func_wrapper
+        self._collected_items[nodeid].set_return(rval)
 
+    @mpsing.ipcmethod
     def finish_test_item(self, report):
         """Mark a test as finished and update the report."""
         self._collected_items[report.nodeid].finish(report)
diff --git a/tests/framework/scheduler.py b/tests/framework/scheduler.py
index 3ae1707709b..ea838b5763d 100644
--- a/tests/framework/scheduler.py
+++ b/tests/framework/scheduler.py
@@ -48,11 +48,11 @@ def __init__(self):
         `PytestScheduler.instance()` to get the scheduler object.
         """
         super().__init__()
-        self._mp_singletons = [self]
-        self.session = None
 
         # Initialize a report for this session
         self._report = treport.Report(defs.TEST_RESULTS_DIR / "report")
+        self._mp_singletons = [self, self._report]
+        self.session = None
 
     def register_mp_singleton(self, mp_singleton):
         """Register a multi-process singleton object.
@@ -124,7 +124,16 @@ def pytest_pyfunc_call(self, pyfuncitem):
         # Overwrite the function with a custom one to catch return values.
         # These are used to catch expected vs. actual values and used in
         # reporting
-        self._report.catch_return(pyfuncitem)
+        original_function = pyfuncitem.obj
+
+        def call_wrapper(*args, **kwargs):
+            # set_return is an IPC method and we can't use any params here
+            # so we just pass things that are picklable
+            self._report.set_return(
+                pyfuncitem.nodeid,
+                original_function(*args, **kwargs))
+
+        pyfuncitem.obj = call_wrapper
 
     def pytest_runtestloop(self, session):
         """Pytest hook. The main test scheduling and running loop.