1 files changed, 3 insertions, 3 deletions
diff --git a/manager.go b/manager.go
index 10de4ef..470fbf3 100644
--- a/manager.go
+++ b/manager.go
@@ -84,13 +84,13 @@ func (f *StringFilter) Filter(w *Work) *Work {
 	}
 
 	changed := false
-	for k, v := range jm {
-		ff, ok := f.FilterFuncMap[k]
+	for field, ff := range f.FilterFuncMap {
+		str, ok := jm[field]
 		if !ok {
 			continue
 		}
 
-		jm[k] = ff(v)
+		jm[field] = ff(str)
 		changed = true
 	}
 	if changed {