diff --git a/pkg/schema/field/timestamp.go b/pkg/schema/field/timestamp.go
index 70d28b61c5d2b281c6672b9607740f3cc77bccee..a96899542709d4cbab72978dce6dbf7e566d86b7 100644
--- a/pkg/schema/field/timestamp.go
+++ b/pkg/schema/field/timestamp.go
@@ -6,8 +6,10 @@ import (
 	"time"
 )
 
-var zeroTime = time.Time{}
-var timestampType = &TimestampType{}
+var (
+	zeroTime      = time.Time{}
+	timestampType = &TimestampType{}
+)
 
 type TimestampParameters struct{}