diff --git a/lib/private/Memcache/Factory.php b/lib/private/Memcache/Factory.php
index 23e0550f62eeb..adb420518568f 100644
--- a/lib/private/Memcache/Factory.php
+++ b/lib/private/Memcache/Factory.php
@@ -129,7 +129,7 @@ protected function getGlobalPrefix(): string {
 			// Include instanceid in the prefix, in case multiple instances use the same cache (e.g. same FPM pool)
 			$instanceid = $config->getValue('instanceid');
 			$installedApps = implode(',', array_keys($versions)) . implode(',', array_values($versions));
-			$this->globalPrefix = hash('xxh128', $instanceid . $installedApps);
+			$this->globalPrefix = $customprefix . hash('xxh128', $instanceid . $installedApps);
 		}
 		return $this->globalPrefix;
 	}
@@ -143,6 +143,8 @@ protected function getGlobalPrefix(): string {
 	public function withServerVersionPrefix(\Closure $closure): void {
 		$backupPrefix = $this->globalPrefix;
 
+		$config = Server::get(SystemConfig::class);
+		$customprefix = $config->getValue('memcache_customprefix', '');
 		// Include instanceid in the prefix, in case multiple instances use the same cache (e.g. same FPM pool)
 		$instanceid = \OCP\Server::get(SystemConfig::class)->getValue('instanceid');
 		$this->globalPrefix = hash('xxh128', $instanceid . implode('.', $this->serverVersion->getVersion()));