diff --git a/remove-spam-high-confidence-maildir.plx b/remove-spam-high-confidence-maildir.plx
old mode 100644
new mode 100755
index a756fd4..a110a89
--- a/remove-spam-high-confidence-maildir.plx
+++ b/remove-spam-high-confidence-maildir.plx
@@ -25,7 +25,8 @@ use Date::Manip;
 
 #use File::Copy;
 
-if (@ARGV < 3 or @ARGV > 4) {
+
+if (@ARGV < 4 or @ARGV > 5) {
   print STDERR "usage: $0 <MAILDIR_DIRECTORY> <DSPAM_PROBABILITY_MIN> <DSPAM_CONFIDENCE_LEVEL_MIN> <DAYS> [<COUNT_ONLY_DONT_DELETE>]\n";
   exit 1;
 }