diff --git a/lib/Controller/KeyController.php b/lib/Controller/KeyController.php
index 038f558..4407c2f 100644
--- a/lib/Controller/KeyController.php
+++ b/lib/Controller/KeyController.php
@@ -66,7 +66,7 @@ public function uploadUserKey($keydata) {
 			$keyinfo = $this->gpg->keyinfo($fingerprint, $this->userId);
 			$key_for_email = false;
 			foreach ($keyinfo[0]['uids'] as $uid) {
-				if ($uid['email'] === $email) {
+				if (strtolower($uid['email']) === strtolower($email)) {
 					$key_for_email = true;
 					break;
 				}