diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index fddc8493f35c11fd9b3afdd932e0ae6ceb651289..81e7fcced4b98173ffeb74392f50f73593979dd8 100644
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -183,7 +183,7 @@ static atomic_t ppp_unit_count = ATOMIC_INIT(0);
 static atomic_t channel_count = ATOMIC_INIT(0);
 
 /* per-net private data for this module */
-static unsigned int ppp_net_id;
+static int ppp_net_id;
 struct ppp_net {
 	/* units to ppp mapping */
 	struct idr units_idr;
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index af6321d97574442d2fee872946ef90d749049d65..e2968f0844394d9674540332885cc2edfd3a687d 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -97,7 +97,7 @@ static const struct proto_ops pppoe_ops;
 static struct ppp_channel_ops pppoe_chan_ops;
 
 /* per-net private data for this module */
-static unsigned int pppoe_net_id;
+static int pppoe_net_id;
 struct pppoe_net {
 	/*
 	 * we could use _single_ hash table for all
diff --git a/drivers/net/pppol2tp.c b/drivers/net/pppol2tp.c
index 1ba0f6864ac4750166e0e297f529f7396f5b1337..5b07dd8e5c04e6b274e303b837c8243b31ba47dc 100644
--- a/drivers/net/pppol2tp.c
+++ b/drivers/net/pppol2tp.c
@@ -232,7 +232,7 @@ static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL };
 static struct proto_ops pppol2tp_ops;
 
 /* per-net private data for this module */
-static unsigned int pppol2tp_net_id;
+static int pppol2tp_net_id;
 struct pppol2tp_net {
 	struct list_head pppol2tp_tunnel_list;
 	rwlock_t pppol2tp_tunnel_list_lock;