diff --git a/pywb/static/search.js b/pywb/static/search.js
index 92bae699..70719c3e 100644
--- a/pywb/static/search.js
+++ b/pywb/static/search.js
@@ -122,7 +122,7 @@ function clearFilters(event) {
 }
 
 function performQuery(url) {
-  var query = [window.wb_prefix + '*?url=' + url];
+  var query = [window.wb_prefix + '*?url=' + encodeURIComponent(url)];
   var filterExpressions = document.getElementById(elemIds.filtering.list)
     .children;
   if (filterExpressions.length) {