diff --git a/ops/base.py b/ops/base.py
index 5f3e819..e2ea90f 100644
--- a/ops/base.py
+++ b/ops/base.py
@@ -22,5 +22,5 @@ def split_list(field, data_list):
     if len(field) != len(data_list):
         return None
     for i, v in enumerate(data_list):
-        data[v] = field[i]
+        data[field[i]] = v
     return data