diff --git a/tail_linux.go b/tail_posix.go
similarity index 83%
rename from tail_linux.go
rename to tail_posix.go
index 60160fd..86998b6 100644
--- a/tail_linux.go
+++ b/tail_posix.go
@@ -1,4 +1,4 @@
-// +build linux
+// +build linux darwin
 
 package tail
 
diff --git a/watch/polling_linux.go b/watch/polling_posix.go
similarity index 89%
rename from watch/polling_linux.go
rename to watch/polling_posix.go
index dd0df1c..6eda4da 100644
--- a/watch/polling_linux.go
+++ b/watch/polling_posix.go
@@ -1,5 +1,5 @@
 // Copyright (c) 2013 ActiveState Software Inc. All rights reserved.
-// +build linux
+// +build linux darwin
 
 package watch