Index: wflow-py/wflow/wflow_bmi.py
===================================================================
diff -u -rfb89328fc3583f23c98872563999d87a38b3cb9e -r8944c14a29922452d94bd04d5eceafbc0d94652e
--- wflow-py/wflow/wflow_bmi.py	(.../wflow_bmi.py)	(revision fb89328fc3583f23c98872563999d87a38b3cb9e)
+++ wflow-py/wflow/wflow_bmi.py	(.../wflow_bmi.py)	(revision 8944c14a29922452d94bd04d5eceafbc0d94652e)
@@ -621,9 +621,16 @@
         using the UDUNITS standard from Unidata. (only if set properly in the ini file)
         """
 
-        units = self.dynModel.wf_supplyVariableUnits(long_var_name)
-        return  str(units)
+        nru = self.dynModel.wf_supplyVariableNamesAndRoles()
 
+        unit ='mm'
+
+        for it in nru:
+            if long_var_name == it[0]:
+                unit = it[2]
+
+        return unit
+
     def set_value(self, long_var_name, src):
         """
         Set the values(s) in a map using a numpy array as source