Index: wflow/pcrglobwb/landSurface.py
===================================================================
diff -u -r8dbcfd5d238baa9609c6e4269b228278b5edb89c -r6f91818718234a2b316afcf26fa8b1938695b672
--- wflow/pcrglobwb/landSurface.py	(.../landSurface.py)	(revision 8dbcfd5d238baa9609c6e4269b228278b5edb89c)
+++ wflow/pcrglobwb/landSurface.py	(.../landSurface.py)	(revision 6f91818718234a2b316afcf26fa8b1938695b672)
@@ -976,9 +976,9 @@
         )
         # extrapolate efficiency map:                                                # TODO: Make a better extrapolation algorithm (considering cell size, etc.).
         window_size = 1.25 * pcr.clone().cellSize()
-        window_size = pcr.min(
+        window_size = min(
             window_size,
-            pcr.min(pcr.clone().nrRows(), pcr.clone().nrCols()) * pcr.clone().cellSize(),
+            min(pcr.clone().nrRows(), pcr.clone().nrCols()) * pcr.clone().cellSize(),
         )
         try:
             self.irrigationEfficiency = pcr.cover(