diff --git a/covjsonkit/decoder/TimeSeries.py b/covjsonkit/decoder/TimeSeries.py
index 709a0a8..1de84ed 100644
--- a/covjsonkit/decoder/TimeSeries.py
+++ b/covjsonkit/decoder/TimeSeries.py
@@ -80,7 +80,7 @@ def to_xarray(self):
 
         param_values = {}
 
-        for parameter in ["ssrd", "2t"]:
+        for parameter in self.parameters:
             param_values[parameter] = []
             for i, num in enumerate(nums):
                 param_values[parameter].append([])