diff --git a/buffer.h b/buffer.h
index 32fd51d..e8de491 100644
--- a/buffer.h
+++ b/buffer.h
@@ -47,10 +47,10 @@ extern void buffer_seek(buffer* b,unsigned int len);
 
 extern int buffer_copy(buffer* out,buffer* in);
 
-int buffer_putulong(buffer *b,unsigned long l);
-int buffer_put8long(buffer *b,unsigned long l);
-int buffer_putxlong(buffer *b,unsigned long l);
-int buffer_putlong(buffer *b,unsigned long l);
+extern int buffer_putulong(buffer *b,unsigned long l);
+extern int buffer_put8long(buffer *b,unsigned long l);
+extern int buffer_putxlong(buffer *b,unsigned long l);
+extern int buffer_putlong(buffer *b,unsigned long l);
 
 extern buffer *buffer_0;
 extern buffer *buffer_0small;