diff --git a/pysplit/traj.py b/pysplit/traj.py
index 8eb70de..16c04ef 100644
--- a/pysplit/traj.py
+++ b/pysplit/traj.py
@@ -439,13 +439,14 @@ def moisture_uptake(self, precipitation, evaporation, interval=6,
 
                 if self.uptake.loc[w, 'dq_initial'] < precipitation:
                     # Adjust previous fractions
-                    self.uptake.loc[is_below, 'dq'] = (
-                        self.uptake.loc[is_below, 'below'] *
-                        self.uptake.loc[w, 'q'])
-
-                    self.uptake.loc[is_above, 'dq'] = (
-                        self.uptake.loc[is_above, 'above'] *
-                        self.uptake.loc[w, 'q'])
+                    if self.uptake.loc[w, 'Timestep'] != 0:
+                      self.uptake.loc[is_below, 'dq'] = (
+                          self.uptake.loc[is_below, 'below'] *
+                          self.uptake.loc[w, 'q'])
+
+                      self.uptake.loc[is_above, 'dq'] = (
+                          self.uptake.loc[is_above, 'above'] *
+                          self.uptake.loc[w, 'q'])
 
     def load_clippedtraj_data(self, clipped_dir='default',
                               fname_end='CLIPPED'):