diff --git a/lib/cache/apc.php b/lib/cache/apc.php
index 6dda0a0ff8..895d307ea2 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;
 	}