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-rwxr-xr-xliveusb/creator.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/liveusb/creator.py b/liveusb/creator.py
index 2891896..c356512 100755
--- a/liveusb/creator.py
+++ b/liveusb/creator.py
@@ -429,7 +429,7 @@ class LinuxLiveUSBCreator(LiveUSBCreator):
elif extlinux < 4:
self.log.debug(_('You are using an old version of syslinux-extlinux '
'that does not support the ext4 filesystem'))
- self.valid_fstypes.remove('ext4')
+ self.valid_fstypes -= set(['ext4'])
def detect_removable_drives(self, callback=None):
""" Detect all removable USB storage devices using UDisks via D-Bus """