diff --git a/test/linkx_run.go b/test/linkx_run.go
index abfc342a6c..5b67ce7d3d 100644
--- a/test/linkx_run.go
+++ b/test/linkx_run.go
@@ -1,3 +1,4 @@
+// +build !nacl
 // run
 
 // Copyright 2014 The Go Authors. All rights reserved.
diff --git a/test/sinit_run.go b/test/sinit_run.go
index a21bd1077d..b0a91ce5b1 100644
--- a/test/sinit_run.go
+++ b/test/sinit_run.go
@@ -1,3 +1,4 @@
+// +build !nacl
 // run
 
 // Copyright 2014 The Go Authors. All rights reserved.