diff --git a/module/VuFindHttp/src/VuFindHttp/HttpService.php b/module/VuFindHttp/src/VuFindHttp/HttpService.php
index ce027a100a7c74454c68a6284723df76524ef1d1..b3f029fd7977fe83c9af34b03c961cfa3f1fc296 100644
--- a/module/VuFindHttp/src/VuFindHttp/HttpService.php
+++ b/module/VuFindHttp/src/VuFindHttp/HttpService.php
@@ -264,7 +264,7 @@ class HttpService implements HttpServiceInterface
      */
     public static function isAssocParams(array $array)
     {
-        foreach ($array as $key => $value) {
+        foreach (array_keys($array) as $key) {
             if (!is_numeric($key)) {
                 return true;
             }