diff --git a/dist/files_opds-0.5.3.tar.gz b/dist/files_opds-0.5.3.tar.gz
index 6f78a9d..715c87d 100644
Binary files a/dist/files_opds-0.5.3.tar.gz and b/dist/files_opds-0.5.3.tar.gz differ
diff --git a/files_opds/lib/google.php b/files_opds/lib/google.php
index 5554aa9..43ed113 100644
--- a/files_opds/lib/google.php
+++ b/files_opds/lib/google.php
@@ -32,9 +32,11 @@ class Google
                         return true;
                 } else {
 			$meta['rescan'] = date("Y-m-d\TH:i:sP", time() + Isbn::RESCAN_NOT_FOUND);
+                	return Isbn::NOT_FOUND;
 		}
 
-                return false;
+		/* not reached */
+                return Isbn::ERROR;
         }
 
         /**