diff --git a/common/modules/io.jsm b/common/modules/io.jsm
index ccfc0b1a..7468d182 100644
--- a/common/modules/io.jsm
+++ b/common/modules/io.jsm
@@ -1117,7 +1117,7 @@ unlet s:cpo_save
                     return Array.from(io.listJar(uri.JARFile, getDir(uri.JAREntry)),
                                       path => ({
                                           isDirectory: () => path.substr(-1) == "/",
-                                          leafName: /([^\/]*)\/?$/.exec(s)[1]
+                                          leafName: /([^\/]*)\/?$/.exec(path)[1]
                                       }));
                 };
             else