diff --git a/lib/subs.php b/lib/subs.php
index a2699f7b99..483b2f78e8 100644
--- a/lib/subs.php
+++ b/lib/subs.php
@@ -58,22 +58,20 @@ function subs_subscribe_to($user, $other) {
 
     subs_notify($other, $user);
 
-	if (common_config('memcached', 'enabled')) {
-		$cache = new Memcache();
-		if ($cache->connect(common_config('memcached', 'server'), common_config('memcached', 'port'))) {
-			$cache->delete(common_cache_key('user:notices_with_friends:' . $user->id));
-		}
+    $cache = common_memcache();
+
+    if ($cache) {
+        $cache->delete(common_cache_key('user:notices_with_friends:' . $user->id));
 	}
 
 	if ($other->autosubscribe && !$other->isSubscribed($user) && !$user->hasBlocked($other)) {
 		if (!$other->subscribeTo($user)) {
 			return _('Could not subscribe other to you.');
 		}
-		if (common_config('memcached', 'enabled')) {
-			$cache = new Memcache();
-			if ($cache->connect(common_config('memcached', 'server'), common_config('memcached', 'port'))) {
-				$cache->delete(common_cache_key('user:notices_with_friends:' . $other->id));
-			}
+        $cache = common_memcache();
+
+        if ($cache) {
+            $cache->delete(common_cache_key('user:notices_with_friends:' . $other->id));
 		}
 
 		subs_notify($user, $other);
@@ -128,11 +126,10 @@ function subs_unsubscribe_to($user, $other) {
 	if (!$sub->delete())
 		return _('Couldn\'t delete subscription.');
 
-	if (common_config('memcached', 'enabled')) {
-		$cache = new Memcache();
-		if ($cache->connect(common_config('memcached', 'server'), common_config('memcached', 'port'))) {
-			$cache->delete(common_cache_key('user:notices_with_friends:' . $user->id));
-		}
+    $cache = common_memcache();
+
+    if ($cache) {
+        $cache->delete(common_cache_key('user:notices_with_friends:' . $user->id));
 	}
 
 	return true;