diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 5bef81c9662..0323c083b9b 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -979,7 +979,8 @@
                         }
                     }
                     if (results['others'].length < maxResults &&
-                        ((query.search && obj.name.indexOf(query.search)) || added === false)) {
+                        ((query.search && obj.name.indexOf(query.search) !== -1) ||
+                          added === false)) {
                         results['others'].push(obj);
                     }
                 }