diff --git a/inc/Data/Driver/MemcacheCacheDriver.php b/inc/Data/Driver/MemcacheCacheDriver.php
index 729f5a50..22330108 100644
--- a/inc/Data/Driver/MemcacheCacheDriver.php
+++ b/inc/Data/Driver/MemcacheCacheDriver.php
@@ -39,12 +39,12 @@ class MemcachedCacheDriver implements CacheDriver {
 
 		if (!$found_in_curr) {
 			if (!empty($current_servers)) {
-				if ($this->inner->resetServerList()) {
+				if (!$this->inner->resetServerList()) {
 					$err = $this->inner->getResultMessage();
 					throw new \RuntimeException("Unable to reset the memcached server list: '$err'");
 				}
 			}
-			if ($this->inner->addServer($server_uri, $server_port, $server_weight)) {
+			if (!$this->inner->addServer($server_uri, $server_port, $server_weight)) {
 				$err = $this->inner->getResultMessage();
 				throw new \RuntimeException("Unable to add memcached servers: '$err'");
 			}