diff --git a/selfdrive/loggerd/tests/test_loggerd.py b/selfdrive/loggerd/tests/test_loggerd.py
index f537e2569b..37d131ba2a 100755
--- a/selfdrive/loggerd/tests/test_loggerd.py
+++ b/selfdrive/loggerd/tests/test_loggerd.py
@@ -209,7 +209,7 @@ class TestLoggerd(unittest.TestCase):
         self.assertEqual(recv_cnt, 0, f"got {recv_cnt} {s} msgs in qlog")
       else:
         # check logged message count matches decimation
-        expected_cnt = len(msgs) // service_list[s].decimation
+        expected_cnt = (len(msgs) - 1) // service_list[s].decimation + 1
         self.assertEqual(recv_cnt, expected_cnt, f"expected {expected_cnt} msgs for {s}, got {recv_cnt}")
 
   def test_rlog(self):