diff --git a/scripts/upgrade b/scripts/upgrade
index e14cd53..7800a53 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -197,11 +197,11 @@ fi
 # Define a function to execute commands with `occ`
 exec_occ() {
     # Backward compatibility to upgrade from NC14 or older version
-    if [ $current_major_version -lt 15 ]
+    if [ $current_major_version = "last" ] || [ $current_major_version -ge 15 ]
     then
-        NEXTCLOUD_PHP_VERSION="7.0"
-    else
         NEXTCLOUD_PHP_VERSION=$YNH_PHP_VERSION
+    else
+        NEXTCLOUD_PHP_VERSION="7.0"
     fi
 (cd "$final_path" && exec_as "$app" \
     php$NEXTCLOUD_PHP_VERSION occ --no-interaction --no-ansi "$@")