1 files changed, 2 insertions, 1 deletions
diff --git a/src/chpst.c b/src/chpst.c
index 86032bc..d65e8fd 100644
--- a/src/chpst.c
+++ b/src/chpst.c
@@ -308,7 +308,8 @@ int main(int argc, char **argv) {
     case 'n':
       switch (*optarg) {
         case '-':
-          if (optarg[scan_ulong(++optarg, &ul)]) usage(); nicelvl =ul;
+          ++optarg;
+          if (optarg[scan_ulong(optarg, &ul)]) usage(); nicelvl =ul;
           nicelvl *=-1;
           break;
         case '+': ++optarg;