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-rw-r--r--disk-utils/isosize.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/disk-utils/isosize.c b/disk-utils/isosize.c
index f90029e2a..5030a50b1 100644
--- a/disk-utils/isosize.c
+++ b/disk-utils/isosize.c
@@ -186,7 +186,7 @@ int main(int argc, char **argv)
long divisor = 0;
static const struct option longopts[] = {
- {"divisor", no_argument, 0, 'd'},
+ {"divisor", required_argument, 0, 'd'},
{"sectors", no_argument, 0, 'x'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},