diff --git a/vimeo.php b/vimeo.php
index b845db2..507ff47 100644
--- a/vimeo.php
+++ b/vimeo.php
@@ -478,11 +478,11 @@ public function upload($file_path, $use_multiple_chunks = false, $chunk_temp_dir
 
         // Make sure our file sizes match up
         foreach ($verify->ticket->chunks as $chunk_check) {
-            $chunk = $chunks[$chunk_check->id];
+            $chunk = $chunks[$chunk_check['id']];
 
-            if ($chunk['size'] != $chunk_check->size) {
+            if ($chunk['size'] != $chunk_check['size']) {
                 // size incorrect, uh oh
-                echo "Chunk {$chunk_check->id} is actually {$chunk['size']} but uploaded as {$chunk_check->size}<br>";
+                echo "Chunk {$chunk_check['id']} is actually {$chunk['size']} but uploaded as {$chunk_check['size']}<br>";
             }
         }