diff --git a/micro_ipfs.js b/micro_ipfs.js
index 7e78ea6..62c464a 100644
--- a/micro_ipfs.js
+++ b/micro_ipfs.js
@@ -310,6 +310,7 @@ var ipfs_self_hash = (function() {
             return i;
           }
         }
+        throw "Could not find entry for directory_hashes.js";
       }
       var foo_link_entry = find_link_entry();
       ipfs_directory_hashes.tree.Links[foo_link_entry].Hash = "";