diff --git a/network/proc/pids_by_user.go b/network/proc/pids_by_user.go
index 0d7ed0c8..0c155fd8 100644
--- a/network/proc/pids_by_user.go
+++ b/network/proc/pids_by_user.go
@@ -1,3 +1,5 @@
+// +build linux
+
 package proc
 
 import (