diff --git a/src/pypungi/splittree.py b/src/pypungi/splittree.py
index a7111cb6..2268b296 100644
--- a/src/pypungi/splittree.py
+++ b/src/pypungi/splittree.py
@@ -109,13 +109,13 @@ self.reserve_size : Additional size needed to be reserved on the first disc.
         """Gets the size as reported by du -sL"""
 
         if blocksize:
-            p = os.popen("du -sL --block-size=1 %s" % path, 'r')
+            p = os.popen("du -slL --block-size=1 %s" % path, 'r')
             thesize = p.read()
             p.close()
             thesize = long(string.split(thesize)[0])
             return thesize
         else:
-            p = os.popen("du -sLh %s" % path, 'r')
+            p = os.popen("du -slLh %s" % path, 'r')
             thesize = p.read()
             p.close()
             thesize = string.split(thesize)[0]