diff --git a/tracetools_analysis/test/tracetools_analysis/test_processor.py b/tracetools_analysis/test/tracetools_analysis/test_processor.py
index 1b25d62..e0614d9 100644
--- a/tracetools_analysis/test/tracetools_analysis/test_processor.py
+++ b/tracetools_analysis/test/tracetools_analysis/test_processor.py
@@ -51,6 +51,19 @@ class StubHandler2(EventHandler):
         self.handler_called = True
 
 
+class WrongHandler(EventHandler):
+
+    def __init__(self) -> None:
+        handler_map = {
+            'myeventname': self._handler_wrong,
+        }
+        super().__init__(handler_map=handler_map)
+
+    def _handler_wrong(
+        self,
+    ) -> None:
+        pass
+
 class TestProcessor(unittest.TestCase):
 
     def __init__(self, *args) -> None:
@@ -58,6 +71,17 @@ class TestProcessor(unittest.TestCase):
             *args,
         )
 
+    def test_handler_wrong_signature(self) -> None:
+        handler = WrongHandler()
+        mock_event = {
+            '_name': 'myeventname',
+            '_timestamp': 0,
+            'cpu_id': 0,
+        }
+        processor = Processor(handler)
+        with self.assertRaises(TypeError):
+            processor.process([mock_event])
+
     def test_handler_method_with_merge(self) -> None:
         handler1 = StubHandler1()
         handler2 = StubHandler2()