diff --git a/metobsapi/data_api.py b/metobsapi/data_api.py
index d3f40576cda8ed6e79be011550cff89d31308cc5..e82763d8d9551966efabd3613cc389995fb34484 100644
--- a/metobsapi/data_api.py
+++ b/metobsapi/data_api.py
@@ -18,8 +18,8 @@ ROUNDING = {
     'aoss.tower.wind_direction': 0,
     'mendota.buoy.rel_hum': 0,
     'mendota.buoy.wind_direction': 0,
-    'mendota.buoy.chlorophyll_ysi': 4,
-    'mendota.buoy.phycocyanin_ysi': 4,
+    'mendota.buoy.chlorophyll_ysi': 2,
+    'mendota.buoy.phycocyanin_ysi': 2,
 }