diff --git a/common/modules/commands.jsm b/common/modules/commands.jsm
index 003ee03a..39e97913 100644
--- a/common/modules/commands.jsm
+++ b/common/modules/commands.jsm
@@ -836,7 +836,7 @@ var Commands = Module("commands", {
                 function completerToString(completer) {
                     if (completer) {
                         for (let [key, val] of Object.entries(config.completers))
-                             if (completion.bound(val) === completer)
+                             if (completion.bound[val] === completer)
                                  return key;
 
                          return "custom";