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-rw-r--r--cmds-fi-usage.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/cmds-fi-usage.c b/cmds-fi-usage.c
index 101a0c4e..6c846c15 100644
--- a/cmds-fi-usage.c
+++ b/cmds-fi-usage.c
@@ -1040,6 +1040,7 @@ void print_device_sizes(struct device_info *devinfo, unsigned unit_mode)
pretty_size_mode(devinfo->device_size, unit_mode));
printf(" Device slack: %*s%10s\n",
(int)(20 - strlen("Device slack")), "",
- pretty_size_mode(devinfo->device_size - devinfo->size,
+ pretty_size_mode(devinfo->device_size > 0 ?
+ devinfo->device_size - devinfo->size : 0,
unit_mode));
}