diff --git a/syscallf/rm_watch.go b/syscallf/rm_watch.go
index 0fb5002..d7f5152 100644
--- a/syscallf/rm_watch.go
+++ b/syscallf/rm_watch.go
@@ -1,3 +1,5 @@
+//go:build linux
+
 package syscallf
 
 import "syscall"