diff --git a/reserve/modrequest.pl b/reserve/modrequest.pl
index 6b4061c724..0d1b2d0262 100755
--- a/reserve/modrequest.pl
+++ b/reserve/modrequest.pl
@@ -66,7 +66,7 @@ if ($CancelBorrowerNumber) {
 # 2) Cancel or modify the queue list of reserves (without item linked)
 else {
     for (my $i=0;$i<$count;$i++){
-        undef $itemnumber[$i] unless $itemnumber[$i] ne '';
+        undef $itemnumber[$i] if !$itemnumber[$i];
         ModReserve({
             rank => $rank[$i],
             reserve_id => $reserve_id[$i],