diff --git a/check_rebootrequired.sh b/check_rebootrequired.sh
index a33218b..a497687 100755
--- a/check_rebootrequired.sh
+++ b/check_rebootrequired.sh
@@ -5,11 +5,7 @@ if [ ! -f "$INPUT" ]; then
 	exit 0
 fi
 
-NUM_LINES=0
-while IFS= read -r line; do
-	((NUM_LINES++))
-done < "$INPUT"
-
+NUM_LINES=`cat "$INPUT" | wc -l`
 echo "WARNING: $NUM_LINES packages require a reboot:"
 cat "$INPUT"