diff --git a/index.js b/index.js
index d6795ab..49d8749 100644
--- a/index.js
+++ b/index.js
@@ -101,7 +101,7 @@ function recursive_filter (input, filters, children_key = 'children') {
     data[i] = e;
     let match = true;
     for (const filter of filters) {
-      const search_str = to_search_string(e, filter.field);
+      const search_str = to_search_string (e, filter.field);
 
       if (!filter.filter.test (search_str)) {
         match = false;
diff --git a/test/index.js b/test/index.js
index dbd6b23..bfa7702 100644
--- a/test/index.js
+++ b/test/index.js
@@ -179,7 +179,7 @@ test ('recursive filter multifield', (t) => {
   ];
   const filtered = [ { name: 'foo', f: 'include' } ];
   const filter = {
-    fields:  [
+    field:  [
       'name',
       'f'
     ],
@@ -189,21 +189,12 @@ test ('recursive filter multifield', (t) => {
   t.deepEqual (filtered, result);
 });
 
-test ('recursive filter multifield input error', (t) => {
-  t.notThrows (() => {
-    util.recursive_filter (
-      [ { foo: 'bar' } ],
-      [ { fields: '', field: 'foo', filter: /a/u } ]
-    );
-  });
-});
-
 test ('recursive filter undefined multifield', (t) => {
   const res = util.recursive_filter (
     [ { foo: 'bar' } ],
     [
       {
-        fields: [
+        field: [
           'foo',
           'bar'
         ],