diff --git a/proto/babel/babel.c b/proto/babel/babel.c
index 8b6abacb..00b9aa79 100644
--- a/proto/babel/babel.c
+++ b/proto/babel/babel.c
@@ -2257,9 +2257,9 @@ babel_kick_timer(struct babel_proto *p)
 
 
 static int
-babel_preexport(struct channel *c, struct rte *new)
+babel_preexport(struct channel *C, struct rte *new)
 {
-  if (new->src->proto != c->proto)
+  if (new->src->proto != C->proto)
     return 0;
 
   /* Reject our own unreachable routes */
diff --git a/proto/bgp/attrs.c b/proto/bgp/attrs.c
index 28eb6fee..1ca77fd5 100644
--- a/proto/bgp/attrs.c
+++ b/proto/bgp/attrs.c
@@ -1929,10 +1929,10 @@ bgp_setup_out_table(struct bgp_channel *c)
  */
 
 int
-bgp_preexport(struct channel *c, rte *e)
+bgp_preexport(struct channel *C, rte *e)
 {
   struct proto *SRC = e->src->proto;
-  struct bgp_proto *p = (struct bgp_proto *) (c->proto);
+  struct bgp_proto *p = (struct bgp_proto *) C->proto;
   struct bgp_proto *src = (SRC->proto == &proto_bgp) ? (struct bgp_proto *) SRC : NULL;
 
   /* Reject our routes */
diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c
index 6a4ee8ab..9c25f0f0 100644
--- a/proto/ospf/ospf.c
+++ b/proto/ospf/ospf.c
@@ -486,13 +486,13 @@ ospf_disp(timer * timer)
  * import to the filters.
  */
 static int
-ospf_preexport(struct channel *c, rte *e)
+ospf_preexport(struct channel *C, rte *e)
 {
-  struct ospf_proto *p = (struct ospf_proto *) c->proto;
+  struct ospf_proto *p = (struct ospf_proto *) C->proto;
   struct ospf_area *oa = ospf_main_area(p);
 
   /* Reject our own routes */
-  if (e->src->proto == c->proto)
+  if (e->src->proto == &p->p)
     return -1;
 
   /* Do not export routes to stub areas */
diff --git a/proto/pipe/pipe.c b/proto/pipe/pipe.c
index 351db36b..8af6de81 100644
--- a/proto/pipe/pipe.c
+++ b/proto/pipe/pipe.c
@@ -73,12 +73,12 @@ pipe_rt_notify(struct proto *P, struct channel *src_ch, const net_addr *n, rte *
 }
 
 static int
-pipe_preexport(struct channel *c, rte *e)
+pipe_preexport(struct channel *C, rte *e)
 {
-  struct pipe_proto *p = (void *) c->proto;
+  struct pipe_proto *p = (void *) C->proto;
 
   /* Avoid direct loopbacks */
-  if (e->sender == c->in_req.hook)
+  if (e->sender == C->in_req.hook)
     return -1;
 
   /* Indirection check */
@@ -86,8 +86,8 @@ pipe_preexport(struct channel *c, rte *e)
   if (e->generation >= max_generation)
   {
     log_rl(&p->rl_gen, L_ERR "Route overpiped (%u hops of %u configured in %s) in table %s: %N %s/%u:%u",
-	e->generation, max_generation, c->proto->name,
-	c->table->name, e->net, e->src->proto->name, e->src->private_id, e->src->global_id);
+	e->generation, max_generation, C->proto->name,
+	C->table->name, e->net, e->src->proto->name, e->src->private_id, e->src->global_id);
 
     return -1;
   }
diff --git a/proto/radv/radv.c b/proto/radv/radv.c
index 3a159462..10d5e3ed 100644
--- a/proto/radv/radv.c
+++ b/proto/radv/radv.c
@@ -394,10 +394,10 @@ radv_net_match_trigger(struct radv_config *cf, const net_addr *n)
 }
 
 int
-radv_preexport(struct channel *c, rte *new)
+radv_preexport(struct channel *C, rte *new)
 {
   // struct radv_proto *p = (struct radv_proto *) P;
-  struct radv_config *cf = (struct radv_config *) (c->proto->cf);
+  struct radv_config *cf = (struct radv_config *) (C->proto->cf);
 
   if (radv_net_match_trigger(cf, new->net))
     return RIC_PROCESS;
diff --git a/sysdep/unix/krt.c b/sysdep/unix/krt.c
index 67d19cbb..46b5a51d 100644
--- a/sysdep/unix/krt.c
+++ b/sysdep/unix/krt.c
@@ -681,9 +681,9 @@ krt_scan_timer_kick(struct krt_proto *p)
  */
 
 static int
-krt_preexport(struct channel *c, rte *e)
+krt_preexport(struct channel *C, rte *e)
 {
-  if (e->src->proto == c->proto)
+  if (e->src->proto == C->proto)
     return -1;
 
   if (!krt_capable(e))