diff --git a/python/swiftest/swiftest/io.py b/python/swiftest/swiftest/io.py
index 64d3f0c6e..3092edad3 100644
--- a/python/swiftest/swiftest/io.py
+++ b/python/swiftest/swiftest/io.py
@@ -855,7 +855,7 @@ def swiftest2xr(param, verbose=True):
         # Check if the name variable contains unique values. If so, make name the dimension instead of id
         if len(np.unique(ds['name'])) == len(ds['name']):
            ds = ds.swap_dims({"id" : "name"})
-           sim.ds.reset_coords("id")
+           ds.reset_coords("id")
     else:
         print(f"Error encountered. OUT_TYPE {param['OUT_TYPE']} not recognized.")
         return None