diff --git a/metobsapi/data_api.py b/metobsapi/data_api.py
index 4fc6eb32821a10fdb7c0fa4f75c376688dbebc88..9549478f0ae2f272a8c301fc230d9aba66500961 100644
--- a/metobsapi/data_api.py
+++ b/metobsapi/data_api.py
@@ -16,6 +16,8 @@ LOG = logging.getLogger(__name__)
 ROUNDING = {
     'rel_hum': 0,
     'wind_direction': 0,
+    'chlorophyll_ysi': 2,
+    'phycocyanin_ysi': 2,
 }