diff --git a/poly1305/sum_amd64.go b/poly1305/sum_amd64.go
index 1501f13..4dd72fe 100644
--- a/poly1305/sum_amd64.go
+++ b/poly1305/sum_amd64.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64,!gccgo,!appengine,go1.7
+// +build amd64,!gccgo,!appengine
 
 package poly1305
 
diff --git a/poly1305/sum_amd64.s b/poly1305/sum_amd64.s
index 56e8311..bc75c61 100644
--- a/poly1305/sum_amd64.s
+++ b/poly1305/sum_amd64.s
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64,!gccgo,!appengine,go1.7
+// +build amd64,!gccgo,!appengine
 
 #include "textflag.h"
 
diff --git a/poly1305/sum_ref.go b/poly1305/sum_ref.go
index 908aae0..dbe50e7 100644
--- a/poly1305/sum_ref.go
+++ b/poly1305/sum_ref.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !amd64,!arm gccgo appengine nacl !go1.7
+// +build !amd64,!arm gccgo appengine nacl
 
 package poly1305