diff --git a/binding/form_mapping.go b/binding/form_mapping.go
index e5426819..ebf3b199 100644
--- a/binding/form_mapping.go
+++ b/binding/form_mapping.go
@@ -38,6 +38,8 @@ type setter interface {
 
 type formSource map[string][]string
 
+var _ setter = formSource(nil)
+
 // TrySet tries to set a value by request's form source (like map[string][]string)
 func (form formSource) TrySet(value reflect.Value, field reflect.StructField, tagValue string, opt setOptions) (isSetted bool, err error) {
 	return setByForm(value, field, form, tagValue, opt)
diff --git a/binding/header.go b/binding/header.go
index ce40b15c..179ce4ea 100644
--- a/binding/header.go
+++ b/binding/header.go
@@ -27,6 +27,8 @@ func mapHeader(ptr interface{}, h map[string][]string) error {
 
 type headerSource map[string][]string
 
+var _ setter = headerSource(nil)
+
 func (hs headerSource) TrySet(value reflect.Value, field reflect.StructField, tagValue string, opt setOptions) (isSetted bool, err error) {
 	return setByForm(value, field, hs, textproto.CanonicalMIMEHeaderKey(tagValue), opt)
 }