diff --git a/tobler/pycno/pycno.py b/tobler/pycno/pycno.py
index 5db663b..afd3594 100644
--- a/tobler/pycno/pycno.py
+++ b/tobler/pycno/pycno.py
@@ -157,7 +157,7 @@ def correct2Dm(data):
         if handle_null:
             sm = astroSmooth2d(value_array)
         else:
-            sm = smooth2d(value_array)
+            sm = smooth2D(value_array)
 
         # Relaxation to prevent overcompensation in the smoothing step
         value_array = value_array * r + (1.0 - r) * sm