diff --git a/lib/configuration.sh b/lib/configuration.sh
index 2f48c66c24..2641389ae8 100644
--- a/lib/configuration.sh
+++ b/lib/configuration.sh
@@ -252,7 +252,7 @@ esac
 
 
 DEBIAN_MIRROR='httpredir.debian.org/debian'
-DEBIAN_SECURTY='http://security.debian.org/'
+DEBIAN_SECURTY='security.debian.org/'
 UBUNTU_MIRROR='ports.ubuntu.com/'
 
 if [[ $DOWNLOAD_MIRROR == china ]] ; then