diff --git a/gridded/da/baseclasses/statevector.py b/gridded/da/baseclasses/statevector.py
index 704713e65994fa6d496f7452f790dcfcfa4289d0..da8942d10bd6b1d6e714837954d8397b75ac3e98 100755
--- a/gridded/da/baseclasses/statevector.py
+++ b/gridded/da/baseclasses/statevector.py
@@ -154,7 +154,7 @@ class StateVector(object):
         #  that maps onto it. From this map, a dictionary is created that allows a reverse look-up so that we can map parameters to a grid.
 
         mapfile = os.path.join(dacycle.dasystem['regionsfile'])
-        ncf = io.CT_Read(mapfile, 'read')
+        ncf = io.ct_read(mapfile, 'read')
         self.gridmap = ncf.get_variable('regions')
         self.tcmap = ncf.get_variable('transcom_regions')
         ncf.close()
@@ -379,7 +379,7 @@ class StateVector(object):
         """
 
         #import da.tools.io as io
-        f = io.CT_Read(filename, 'read')
+        f = io.ct_read(filename, 'read')
         meanstate = f.get_variable('statevectormean_' + qual)
         ensmembers = f.get_variable('statevectorensemble_' + qual)
         f.close()