diff --git a/bin/hardening/5.2.15_ssh_cry_kex.sh b/bin/hardening/5.2.15_ssh_cry_kex.sh
index 1a0a070..c6c774f 100755
--- a/bin/hardening/5.2.15_ssh_cry_kex.sh
+++ b/bin/hardening/5.2.15_ssh_cry_kex.sh
@@ -75,7 +75,7 @@ apply() {
 create_config() {
     set +u
     debug "Debian version : $DEB_MAJ_VER "
-    if [[ 7 -le "$DEB_MAJ_VER" ]]; then
+    if [[ "$DEB_MAJ_VER" -le 7 ]]; then
         KEX='diffie-hellman-group-exchange-sha256'
     else
         KEX='curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256'