diff --git a/driver/driver_stub.go b/driver/driver_stub.go
index 31ff843..6f68af9 100644
--- a/driver/driver_stub.go
+++ b/driver/driver_stub.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 aix dragonfly freebsd netbsd openbsd solaris
+// +build aix dragonfly freebsd netbsd openbsd solaris
 
 package driver