diff --git a/cc/manifest.php b/cc/manifest.php
index e3293a6..cae222a 100644
--- a/cc/manifest.php
+++ b/cc/manifest.php
@@ -99,7 +99,7 @@ public function build_flat_file(){
   }
 
   public function cleanup() {
-    if( isset($this->tmp_file) && get_resource_type($this->tmp_file) === 'file' ){
+    if( isset($this->tmp_file) && file_exists($this->tmp_file) ){
       unlink($this->tmp_file);
     }
   }