diff --git a/lib/path-set.js b/lib/path-set.js
index b1c478c..68b64ea 100644
--- a/lib/path-set.js
+++ b/lib/path-set.js
@@ -45,7 +45,7 @@ class PathSet {
     for (let i = 0; i < path.length; ++ i) {
       let fragment = path[i];
       if (fragment === "*")
-        wildcard |= 1 << i;
+        wildcard = wildcard | (1 << i);
 
       if (!this.fragmentIndex[i])
         this.fragmentIndex[i] = {};