diff --git a/foodoor-update-keydb b/foodoor-update-keydb
index 4031c54..9455502 100755
--- a/foodoor-update-keydb
+++ b/foodoor-update-keydb
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 
 export PATH="/usr/bin:/bin:/usr/sbin:/sbin"
@@ -22,10 +22,11 @@ do
     find "${dest}/keys" -name '*.pub' | sort | \
         while read keyfile
         do
-            valid_key=$(ssh-keygen -l -f ${keyfile})
-            if [ "$?" -eq "0" ]; then
-                if [ $(echo "${valid_key}" | cut -d" " -f1) -lt "4096" ]; then
-                    echo "Size of key ${keyfile} is less than 4096. Not adding it to key database." >&2
+			ssh-keygen -l -f ${keyfile} &> /dev/null
+			if [ $? -eq 0 ]; then
+				key_length=`ssh-keygen -l -f ${keyfile} | cut -d" " -f1`
+				if [ ${key_length} -lt 4096 ]; then
+                    echo "Key size of key ${keyfile} not equal to 4096. Not adding it to key database." >&2
                     continue
                 fi
             fi