diff --git a/lib/private/User/Manager.php b/lib/private/User/Manager.php
index cf832148c920f..12898aef419bd 100644
--- a/lib/private/User/Manager.php
+++ b/lib/private/User/Manager.php
@@ -149,6 +149,10 @@ public function get($uid) {
 	}
 
 	public function getDisplayName(string $uid): ?string {
+		if (isset($this->cachedUsers[$uid])) {
+			return $this->cachedUsers[$uid]->getDisplayName();
+		}
+
 		return $this->displayNameCache->getDisplayName($uid);
 	}