diff --git a/dumux/io/pointcloudvtkwriter.hh b/dumux/io/pointcloudvtkwriter.hh
index 767ca96ebd78b76d2efc50dd88b0d0425e97df0c..c008658e0a126745d75ad09c687d61c1fb5f6357 100644
--- a/dumux/io/pointcloudvtkwriter.hh
+++ b/dumux/io/pointcloudvtkwriter.hh
@@ -332,6 +332,8 @@ private:
                 file << " 0 0 ";
             if(x.size() == 2)
                 file << " 0 ";
+            if(x.size() == 3)
+                file << " ";
 
             // introduce a line break after a certain time
             if((++counter)  > numBeforeLineBreak)