diff --git a/python/damask/table.py b/python/damask/table.py
index a4badb3dc..b704bdc24 100644
--- a/python/damask/table.py
+++ b/python/damask/table.py
@@ -350,4 +350,4 @@ class Table():
             f = fname
 
         for line in header + [' '.join(labels)]: f.write(line+'\n')
-        self.data.to_csv(f,sep=' ',index=False,header=False)
+        self.data.to_csv(f,sep=' ',na_rep='nan',index=False,header=False)