diff --git a/tail_posix.go b/tail_posix.go
index 86998b6..3987b7e 100644
--- a/tail_posix.go
+++ b/tail_posix.go
@@ -1,4 +1,4 @@
-// +build linux darwin
+// +build linux darwin freebsd
 
 package tail
 
diff --git a/watch/polling_posix.go b/watch/polling_posix.go
index 6eda4da..1a75546 100644
--- a/watch/polling_posix.go
+++ b/watch/polling_posix.go
@@ -1,5 +1,5 @@
 // Copyright (c) 2013 ActiveState Software Inc. All rights reserved.
-// +build linux darwin
+// +build linux darwin freebsd
 
 package watch