diff --git a/pyanaconda/storage/__init__.py b/pyanaconda/storage/__init__.py
index 0c5ace3..132785b 100644
--- a/pyanaconda/storage/__init__.py
+++ b/pyanaconda/storage/__init__.py
@@ -708,6 +708,7 @@ class Storage(object):
self.config.clearPartType.
"""
from partitioning import shouldClear
+ from size import Size
if disks is None:
disks = self.disks
@@ -718,7 +719,7 @@ class Storage(object):
for disk in [d for d in disks if d.partitioned]:
should_clear = shouldClear(disk, clearPartType, [disk.name])
if should_clear:
- free[disk.name] = (disk.size, 0)
+ free[disk.name] = (Size(spec="%f mb" % disk.size), 0)
continue