diff --git a/udisks-1.93.0-fix-unmounting-large-disks.patch b/udisks-1.93.0-fix-unmounting-large-disks.patch
new file mode 100644
index 0000000..9f9d62b
--- /dev/null
+++ b/udisks-1.93.0-fix-unmounting-large-disks.patch
@@ -0,0 +1,40 @@
+From 5dd2ef0710584626f81a89b81180fa81d04b6956 Mon Sep 17 00:00:00 2001
+From: Edward Sheldrake <ejsheldrake@gmail.com>
+Date: Sun, 1 Apr 2012 15:58:08 +0100
+Subject: [PATCH] Fix unmounting large disks when not asked to
+
+udisks2 was "Cleaning up mount point" claiming the device no longer existed.
+Disk size may be larger than INT_MAX for large disks.
+
+https://bugs.freedesktop.org/show_bug.cgi?id=48155
+
+Signed-off-by: David Zeuthen <davidz@redhat.com>
+---
+ src/udiskscleanup.c |    4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/udiskscleanup.c b/src/udiskscleanup.c
+index b5b61c1..9daa980 100644
+--- a/src/udiskscleanup.c
++++ b/src/udiskscleanup.c
+@@ -605,7 +605,7 @@ udisks_cleanup_check_mounted_fs_entry (UDisksCleanup  *cleanup,
+       /* if umounting, issue 'change' event on the device after unmounting it */
+       change_sysfs_path = g_strdup (g_udev_device_get_sysfs_path (udev_device));
+ 
+-      if (g_udev_device_get_sysfs_attr_as_int (udev_device, "size") > 0)
++      if (g_udev_device_get_sysfs_attr_as_uint64 (udev_device, "size") > 0)
+         {
+           /* for partition, also check enclosing device */
+           if (g_strcmp0 (g_udev_device_get_devtype (udev_device), "partition") == 0)
+@@ -614,7 +614,7 @@ udisks_cleanup_check_mounted_fs_entry (UDisksCleanup  *cleanup,
+               udev_device_disk = g_udev_device_get_parent_with_subsystem (udev_device, "block", "disk");
+               if (udev_device_disk != NULL)
+                 {
+-                  if (g_udev_device_get_sysfs_attr_as_int (udev_device_disk, "size") > 0)
++                  if (g_udev_device_get_sysfs_attr_as_uint64 (udev_device_disk, "size") > 0)
+                     {
+                       device_exists = TRUE;
+                     }
+-- 
+1.7.9.3
+
diff --git a/udisks2.spec b/udisks2.spec
index 3917169..ee301a0 100644
--- a/udisks2.spec
+++ b/udisks2.spec
@@ -8,7 +8,7 @@
 Summary: Disk Manager
 Name: udisks2
 Version: 1.93.0
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: GPLv2+
 Group: System Environment/Libraries
 URL: http://www.freedesktop.org/wiki/Software/udisks
@@ -51,6 +51,8 @@ Requires: acl
 # for /proc/self/mountinfo, only available in 2.6.26 or higher
 Conflicts: kernel < 2.6.26
 
+Patch0: udisks-1.93.0-fix-unmounting-large-disks.patch
+
 %description
 udisks provides a daemon, D-Bus API and command line tools for
 managing disks and storage devices. This package is for the udisks 2.x
@@ -80,6 +82,7 @@ daemon. This package is for the udisks 2.x series.
 
 %prep
 %setup -q -n udisks-%{version}
+%patch0 -p1
 
 %build
 %configure --enable-gtk-doc
@@ -137,6 +140,9 @@ rm -f $RPM_BUILD_ROOT%{_libdir}/*.a
 
 # Note: please don't forget the %{?dist} in the changelog. Thanks
 %changelog
+* Tue Apr 03 2012 David Zeuthen <davidz@redhat.com> - 1.93.0-2%{?dist}
+- Don't inadvertently unmount large block devices (fdo #48155)
+
 * Mon Mar 05 2012 David Zeuthen <davidz@redhat.com> - 1.93.0-1%{?dist}
 - Update to release 1.93.0