diff --git a/json/json.go b/json/json.go
index 57172ee6..d2d0f8b3 100644
--- a/json/json.go
+++ b/json/json.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.
 
-//+build !jsoniter
+// +build !jsoniter
 
 package json
 
diff --git a/json/jsoniter.go b/json/jsoniter.go
index 8e01f116..65deee59 100644
--- a/json/jsoniter.go
+++ b/json/jsoniter.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.
 
-//+build jsoniter
+// +build jsoniter
 
 package json