diff --git a/apps/user_ldap/lib/user/user.php b/apps/user_ldap/lib/user/user.php
index 43ff6014c9..9bf505c5c2 100644
--- a/apps/user_ldap/lib/user/user.php
+++ b/apps/user_ldap/lib/user/user.php
@@ -217,7 +217,11 @@ class User {
 		foreach ($attrs as $attr)  {
 			if(isset($ldapEntry[$attr])) {
 				$this->avatarImage = $ldapEntry[$attr][0];
-				$this->updateAvatar();
+				// the call to the method that saves the avatar in the file
+				// system must be postponed after the login. It is to ensure
+				// external mounts are mounted properly (e.g. with login
+				// credentials from the session).
+				\OCP\Util::connectHook('OC_User', 'post_login', $this, 'updateAvatarPostLogin');
 				break;
 			}
 		}
@@ -461,6 +465,17 @@ class User {
 		}
 	}
 
+	/**
+	 * called by a post_login hook to save the avatar picture
+	 *
+	 * @param array $params
+	 */
+	public function updateAvatarPostLogin($params) {
+		if(isset($params['uid']) && $params['uid'] === $this->getUsername()) {
+			$this->updateAvatar();
+		}
+	}
+
 	/**
 	 * @brief attempts to get an image from LDAP and sets it as ownCloud avatar
 	 * @return null
diff --git a/apps/user_ldap/tests/user/user.php b/apps/user_ldap/tests/user/user.php
index ca8d81a4b7..ed04520aa7 100644
--- a/apps/user_ldap/tests/user/user.php
+++ b/apps/user_ldap/tests/user/user.php
@@ -798,6 +798,7 @@ class Test_User_User extends \Test\TestCase {
 		}
 
 		$userMock->processAttributes($record);
+		\OC_Hook::emit('OC_User', 'post_login', array('uid' => $uid));
 	}
 
 	public function emptyHomeFolderAttributeValueProvider() {