diff --git a/nest/iface.c b/nest/iface.c
index 831b3e26..ce638d22 100644
--- a/nest/iface.c
+++ b/nest/iface.c
@@ -341,7 +341,7 @@ auto_router_id(void)			/* FIXME: What if we run IPv6??? */
 	(!j || ipa_to_u32(i->ip) < ipa_to_u32(j->ip)))
       j = i;
   if (!j)				/* FIXME: allow configuration or running without RID */
-    die("Cannot determine router ID, please configure manually");
+    bug("Cannot determine router ID, please configure manually");
   router_id = ipa_to_u32(j->ip);
   debug("Router ID set to %08x (%s)\n", router_id, j->name);
 }
diff --git a/nest/rt-fib.c b/nest/rt-fib.c
index 15db74c4..f436525a 100644
--- a/nest/rt-fib.c
+++ b/nest/rt-fib.c
@@ -132,7 +132,7 @@ fib_get(struct fib *f, ip_addr *a, int len)
     return e;
 #ifdef DEBUGGING
   if (len < 0 || len > BITS_PER_IP_ADDRESS || !ip_is_prefix(*a,len))
-    die("fib_get() called for invalid address");
+    bug("fib_get() called for invalid address");
 #endif
   e = sl_alloc(f->fib_slab);
   e->prefix = *a;
@@ -215,7 +215,7 @@ fib_delete(struct fib *f, void *E)
 	}
       ee = &((*ee)->next);
     }
-  die("fib_delete() called for invalid node");
+  bug("fib_delete() called for invalid node");
 }
 
 void
@@ -305,29 +305,29 @@ fib_check(struct fib *f)
 	  struct fib_iterator *j, *j0;
 	  unsigned int h0 = ipa_hash(n->prefix);
 	  if (h0 < lo)
-	    die("fib_check: discord in hash chains");
+	    bug("fib_check: discord in hash chains");
 	  lo = h0;
 	  if ((h0 >> f->hash_shift) != i)
-	    die("fib_check: mishashed %x->%x (order %d)", h0, i, f->hash_order);
+	    bug("fib_check: mishashed %x->%x (order %d)", h0, i, f->hash_order);
 	  j0 = (struct fib_iterator *) n;
 	  nulls = 0;
 	  for(j=n->readers; j; j=j->next)
 	    {
 	      if (j->prev != j0)
-		die("fib_check: iterator->prev mismatch");
+		bug("fib_check: iterator->prev mismatch");
 	      j0 = j;
 	      if (!j->node)
 		nulls++;
 	      else if (nulls)
-		die("fib_check: iterator nullified");
+		bug("fib_check: iterator nullified");
 	      else if (j->node != n)
-		die("fib_check: iterator->node mismatch");
+		bug("fib_check: iterator->node mismatch");
 	    }
 	  ec++;
 	}
     }
   if (ec != f->entries)
-    die("fib_check: invalid entry count (%d != %d)", ec, f->entries);
+    bug("fib_check: invalid entry count (%d != %d)", ec, f->entries);
 }
 
 #endif
diff --git a/nest/rt-table.c b/nest/rt-table.c
index b35297bb..0ccb8da6 100644
--- a/nest/rt-table.c
+++ b/nest/rt-table.c
@@ -97,7 +97,7 @@ rte_better(rte *new, rte *old)
   if (new->attrs->proto != old->attrs->proto)
     {
       /* FIXME!!! */
-      die("Different protocols, but identical preferences => oops");
+      bug("Different protocols, but identical preferences => oops");
     }
   if (better = new->attrs->proto->rte_better)
     return better(new, old);
diff --git a/proto/static/static.c b/proto/static/static.c
index d1fe217b..7844460e 100644
--- a/proto/static/static.c
+++ b/proto/static/static.c
@@ -82,7 +82,7 @@ static_start(struct proto *P)
 	  break;
 	}
       case RTD_DEVICE:
-	die("Static device routes are not supported");
+	bug("Static device routes are not supported");
 	/* FIXME: Static device routes */
       default:
 	static_install(p, r, NULL);
diff --git a/sysdep/linux/krt-scan.c b/sysdep/linux/krt-scan.c
index 9801f8a3..f1c00908 100644
--- a/sysdep/linux/krt-scan.c
+++ b/sysdep/linux/krt-scan.c
@@ -291,7 +291,7 @@ krt_prune(struct krt_proto *p)
 	  rte_update(n, &p->p, new);
 	  break;
 	default:
-	  die("krt_prune: invalid route status");
+	  bug("krt_prune: invalid route status");
 	}
 
       if (old)
diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index 33406664..0d8f1257 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -293,7 +293,7 @@ void
 get_sockaddr(struct sockaddr_in *sa, ip_addr *a, unsigned *port)
 {
   if (sa->sin_family != AF_INET)
-    die("get_sockaddr called for wrong address family");
+    bug("get_sockaddr called for wrong address family");
   if (port)
     *port = ntohs(sa->sin_port);
   memcpy(a, &sa->sin_addr.s_addr, sizeof(*a));
@@ -379,7 +379,7 @@ sk_open(sock *s)
       fd = socket(PF_INET, SOCK_RAW, s->dport);
       break;
     default:
-      die("sk_open() called for invalid sock type %d", s->type);
+      bug("sk_open() called for invalid sock type %d", s->type);
     }
   if (fd < 0)
     die("sk_open: socket: %m");
@@ -530,7 +530,7 @@ sk_maybe_write(sock *s)
 	return 1;
       }
     default:
-      die("sk_maybe_write: unknown socket type %d", s->type);
+      bug("sk_maybe_write: unknown socket type %d", s->type);
     }
 }
 
diff --git a/sysdep/unix/krt-set.c b/sysdep/unix/krt-set.c
index 33d5bca0..83984fec 100644
--- a/sysdep/unix/krt-set.c
+++ b/sysdep/unix/krt-set.c
@@ -77,7 +77,7 @@ krt_ioctl(int ioc, rte *e, char *name)
       break;
 #endif
     default:
-      die("krt set: unknown flags, but not filtered");
+      bug("krt set: unknown flags, but not filtered");
     }
 
   if (ioctl(if_scan_sock, ioc, &re) < 0)
@@ -127,6 +127,6 @@ void
 krt_set_preconfig(struct krt_proto *x)
 {
   if (if_scan_sock < 0)
-    die("krt set: missing socket");
+    bug("krt set: missing socket");
   x->p.rt_notify = krt_set_notify;
 }
diff --git a/sysdep/unix/main.c b/sysdep/unix/main.c
index f5076c41..a2b33180 100644
--- a/sysdep/unix/main.c
+++ b/sysdep/unix/main.c
@@ -121,5 +121,5 @@ main(void)
   debug("Entering I/O loop.\n");
 
   io_loop();
-  die("I/O loop died");
+  bug("I/O loop died");
 }