diff --git a/tracer/Makefile b/tracer/Makefile
index 06e2f08108..53469d4e58 100644
--- a/tracer/Makefile
+++ b/tracer/Makefile
@@ -9,4 +9,4 @@ logs/trace.latency.log:
 	  gst-launch-1.0 -q audiotestsrc num-buffers=10 wave=silence ! audioconvert ! autoaudiosink
 
 check: $(TEST_DATA)
-	python3 -m unittest discover tracer
+	python3 -m unittest discover tracer "*_test.py"
diff --git a/tracer/tracer/parser_test.py b/tracer/tracer/parser_test.py
index 0a3f6c1a3d..dc0f3c7fb9 100644
--- a/tracer/tracer/parser_test.py
+++ b/tracer/tracer/parser_test.py
@@ -43,4 +43,4 @@ class TestParser(unittest.TestCase):
         sys.stdin = TRACER_LOG_DATA
         with Parser('-') as log:
             event = next(log)
-            self.assertEquals(len(event), 10)
+            self.assertEqual(len(event), 10)