diff --git a/setup.php b/setup.php
index 68ebce0..daba584 100755
--- a/setup.php
+++ b/setup.php
@@ -8,7 +8,7 @@ if (!file_exists('/var/www/html/.env')) {
 
 $cmd = getopt("", ["sqlite", "mysql", "mariadb", "pgsql", "shared"]);
 
-$key = `openssl rand -base64 32 | tr -d '=' | tr -d '+'  | tr -d '/' | tr -d ' '`;
+$key = shell_exec("openssl rand -base64 32 | tr -d '=' | tr -d '+'  | tr -d '/' | tr -d ' '");
 $key = substr($key, 0, 32);
 $database_url = null;
 $getCreds = true;