diff --git a/lib/cache/apc.php b/lib/cache/apc.php
index 6dda0a0ff8c8fb858a93943fd282a8ef27d3079f..895d307ea26bd9c5d9a2fc6529660568e912642d 100644
--- a/lib/cache/apc.php
+++ b/lib/cache/apc.php
@@ -57,7 +57,7 @@ class OC_Cache_APC {
 if(!function_exists('apc_exists')) {
 	function apc_exists($keys)
 	{
-		$result;
+		$result=false;
 		apc_fetch($keys, $result);
 		return $result;
 	}