diff --git a/buffer/buffer_close.c b/buffer/buffer_close.c
index ebd8691..7a2276a 100644
--- a/buffer/buffer_close.c
+++ b/buffer/buffer_close.c
@@ -2,6 +2,6 @@
 #include <unistd.h>
 
 void buffer_close(buffer* b) {
-  if (b->fd != -1) close(b->fd);
+  if (b->fd > 2) close(b->fd);
   if (b->deinit) b->deinit(b);
 }
diff --git a/buffer/buffer_frombuf.c b/buffer/buffer_frombuf.c
index 0d22e50..0c9d931 100644
--- a/buffer/buffer_frombuf.c
+++ b/buffer/buffer_frombuf.c
@@ -15,4 +15,5 @@ void buffer_frombuf(buffer* b,const char* x,size_t l) {
   b->a=l;
   b->fd=0;
   b->op=dummyreadwrite;
+  b->deinit=0;
 }
diff --git a/buffer/buffer_tosa.c b/buffer/buffer_tosa.c
index aa6f119..99812ea 100644
--- a/buffer/buffer_tosa.c
+++ b/buffer/buffer_tosa.c
@@ -22,5 +22,6 @@ int buffer_tosa(buffer* b,stralloc* sa) {
   b->fd=0;
   b->op=strallocwrite;
   b->cookie=sa;
+  b->deinit=0;
   return 0;
 }
diff --git a/socket/fmt_ip6ifc.c b/socket/fmt_ip6ifc.c
index 51f872d..3bd60b7 100644
--- a/socket/fmt_ip6ifc.c
+++ b/socket/fmt_ip6ifc.c
@@ -3,7 +3,7 @@
 #include "ip4.h"
 #include "ip6.h"
 
-unsigned int fmt_ip6ifc(char *s,const char ip[16],uint32 scope_id)
+size_t fmt_ip6ifc(char *s,const char ip[16],uint32 scope_id)
 {
   if (ip6_isv4mapped(ip))
     return fmt_ip4(s,ip+12);