diff --git a/module/VuFind/src/VuFind/Recommend/AuthorityRecommend.php b/module/VuFind/src/VuFind/Recommend/AuthorityRecommend.php
index a6ca9e99c953f11cf28f016ed56eca380fdf408d..5b69e7f5c257b1ea27735ad2d09c215375b48c35 100644
--- a/module/VuFind/src/VuFind/Recommend/AuthorityRecommend.php
+++ b/module/VuFind/src/VuFind/Recommend/AuthorityRecommend.php
@@ -117,7 +117,7 @@ class AuthorityRecommend implements RecommendInterface
                 if ($params[$i] == '__resultlimit__') {
                     $this->resultLimit = intval($params[$i + 1]);
                 } else {
-                    $this->filters[] = $params[$i] . ':(' . $params[$i + 1] . ')';
+                    $this->filters[] = $params[$i] . ':' . $params[$i + 1];
                 }
             }
         }