diff --git a/public/recaptchalib.php b/public/recaptchalib.php
index e658a2e..c8c3685 100644
--- a/public/recaptchalib.php
+++ b/public/recaptchalib.php
@@ -108,7 +108,8 @@ function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
 		die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>");
 	}
 	
-	if ($use_ssl) {
+        if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off'
+        || $_SERVER['SERVER_PORT'] == 443) {
                 $server = RECAPTCHA_API_SECURE_SERVER;
         } else {
                 $server = RECAPTCHA_API_SERVER;