diff --git a/test/residual_test/residual_test.py b/test/residual_test/residual_test.py
index e1fe36f2b6708130d5bd2c3ef6a139bc2061b795..bae9bc5a91e4e9a817a8940b8318f07302665498 100644
--- a/test/residual_test/residual_test.py
+++ b/test/residual_test/residual_test.py
@@ -87,7 +87,7 @@ def test_CMO_summaries():
         assert_equal(reading.metadata["station"], "CMO")
         assert_equal(reading.metadata["instrument"], 200803)
         assert_equal(reading.pier_correction, 10.5)
-    assert_equal(len(readings), 26)
+    assert_equal(len(readings), 28)
 
     assert readings[0].time > starttime
     assert readings[-1].time < endtime