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-rw-r--r--winsup/utils/regtool.cc5
1 files changed, 4 insertions, 1 deletions
diff --git a/winsup/utils/regtool.cc b/winsup/utils/regtool.cc
index 403923b2d..6954c6556 100644
--- a/winsup/utils/regtool.cc
+++ b/winsup/utils/regtool.cc
@@ -674,7 +674,10 @@ main (int argc, char **_argv)
print_version ();
exit (0);
case 'K':
- key_sep = *optarg;
+ if (!optarg)
+ usage ();
+ else
+ key_sep = *optarg;
break;
default :
usage ();