diff --git a/pym/cl_builder.py b/pym/cl_builder.py
index afd048b..138f813 100644
--- a/pym/cl_builder.py
+++ b/pym/cl_builder.py
@@ -176,9 +176,9 @@ class cl_builder(color_print):
     def getFreeFor(self,pathname):
         """Get free for pathname"""
         dfProcess = process("/bin/df","-h",pathname)
-        data = filter(lambda x:x.startswith('/dev'),dfProcess)
-        if data:
-            data = filter(lambda x:x,data[0].split())
+        data = dfProcess.readlines()
+        if len(data)>1:
+            data = filter(lambda x:x,"\t".join(data[1:]).split())
             if len(data)>3:
                 return data[3]
         return "Unknown"
@@ -198,7 +198,8 @@ class cl_builder(color_print):
             self.getFreeFor(path.dirname(path.normpath(
                     self.clVars.Get('cl_builder_iso_path')))))
         self.printSUCCESS(_("Free disk space for iso image: %s")%
-                self.getFreeFor(self.clVars.Get('cl_builder_image')))
+                self.getFreeFor(path.dirname(path.normpath(
+                    self.clVars.Get('cl_builder_image')))))
         self.defaultPrint("%s\n"%_("Perform pre-install checkups"))
 
         if self.clVars.Get('cl_builder_image'):