diff --git a/field/assign_attr.go b/field/assign_attr.go
index eab5fb91..aef51d6e 100644
--- a/field/assign_attr.go
+++ b/field/assign_attr.go
@@ -78,7 +78,7 @@ func (att *attrs) Values() interface{} {
 	if all {
 		return map[string]interface{}{}
 	}
-	for fn, _ := range fm {
+	for fn := range fm {
 		delete(values, fn)
 	}
 	return values
diff --git a/field/tag.go b/field/tag.go
index 1478b15c..703929e8 100644
--- a/field/tag.go
+++ b/field/tag.go
@@ -55,7 +55,7 @@ func (tag Tag) Remove(key string) Tag {
 }
 
 func (tag Tag) Build() string {
-	if tag == nil || len(tag) == 0 {
+	if len(tag) == 0 {
 		return ""
 	}
 
@@ -92,7 +92,7 @@ func (tag GormTag) Remove(key string) GormTag {
 }
 
 func (tag GormTag) Build() string {
-	if tag == nil || len(tag) == 0 {
+	if len(tag) == 0 {
 		return ""
 	}
 	tags := make([]string, 0, len(tag))
@@ -128,7 +128,7 @@ func tagKeys(tag Tag) []string {
 	if len(tag) == 0 {
 		return keys
 	}
-	for k, _ := range tag {
+	for k := range tag {
 		keys = append(keys, k)
 	}
 	return keySort(keys)
@@ -139,7 +139,7 @@ func gormKeys(tag GormTag) []string {
 	if len(tag) == 0 {
 		return keys
 	}
-	for k, _ := range tag {
+	for k := range tag {
 		keys = append(keys, k)
 	}
 	return keySort(keys)