diff --git a/lib/IMAP.php b/lib/IMAP.php
index 791d49a..cd5e8ec 100644
--- a/lib/IMAP.php
+++ b/lib/IMAP.php
@@ -98,9 +98,10 @@ class IMAP extends Base {
 		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
 		curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'CAPABILITY');
 
-		$canconnect = curl_exec($ch);
+		curl_exec($ch);
+		$errorcode = curl_errno($ch);
 
-		if ($canconnect) {
+		if ($errorcode === 0) {
 			curl_close($ch);
 			$uid = mb_strtolower($uid);
 			$this->storeUser($uid, $groups);