Index: wflow-py/wflow/wflow_hbv.py
===================================================================
diff -u -r82f9be039caa728844eeb721c887b2d84fa196cc -r77cca294ac6e8e18c407e9ea699b7825633e81d9
--- wflow-py/wflow/wflow_hbv.py	(.../wflow_hbv.py)	(revision 82f9be039caa728844eeb721c887b2d84fa196cc)
+++ wflow-py/wflow/wflow_hbv.py	(.../wflow_hbv.py)	(revision 77cca294ac6e8e18c407e9ea699b7825633e81d9)
@@ -669,7 +669,7 @@
     self.thestep = self.thestep + 1
 
     self.wf_updateparameters() # read forcing an dynamic parameters
-    self.Precipitation = max(0,0,self.Precipitation)
+    self.Precipitation = max(0.0,self.Precipitation)
 
     #self.Precipitation=cover(self.wf_readmap(self.P_mapstack,0.0),0.0) * self.Pcorr
     #self.PotEvaporation=cover(self.wf_readmap(self.PET_mapstack,0.0),0.0)
Index: wflow-py/wflow/wflow_sbm.py
===================================================================
diff -u -r82f9be039caa728844eeb721c887b2d84fa196cc -r77cca294ac6e8e18c407e9ea699b7825633e81d9
--- wflow-py/wflow/wflow_sbm.py	(.../wflow_sbm.py)	(revision 82f9be039caa728844eeb721c887b2d84fa196cc)
+++ wflow-py/wflow/wflow_sbm.py	(.../wflow_sbm.py)	(revision 77cca294ac6e8e18c407e9ea699b7825633e81d9)
@@ -922,7 +922,7 @@
         # Read forcing data and dynamic parameters
 
         self.wf_updateparameters()
-        self.Precipitation = max(0,0,self.Precipitation)
+        self.Precipitation = max(0.0,self.Precipitation)
 
 
         if hasattr(self,"LAI"):