diff --git a/portlist/portlist.go b/portlist/portlist.go
index 883f373f7..521edcf49 100644
--- a/portlist/portlist.go
+++ b/portlist/portlist.go
@@ -21,8 +21,6 @@ type Port struct {
 // List is a list of Ports.
 type List []Port
 
-var protos = []string{"tcp", "udp"}
-
 func (a *Port) lessThan(b *Port) bool {
 	if a.Port < b.Port {
 		return true
diff --git a/portlist/portlist_linux.go b/portlist/portlist_linux.go
index 0e4088635..d8756c253 100644
--- a/portlist/portlist_linux.go
+++ b/portlist/portlist_linux.go
@@ -24,6 +24,7 @@ const pollInterval = 1 * time.Second
 // TODO(apenwarr): Include IPv6 ports eventually.
 // Right now we don't route IPv6 anyway so it's better to exclude them.
 var sockfiles = []string{"/proc/net/tcp", "/proc/net/udp"}
+var protos = []string{"tcp", "udp"}
 
 func listPorts() (List, error) {
 	l := []Port{}