diff --git a/include/stdio.h b/include/stdio.h
index de11d350..825ae88e 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -78,6 +78,7 @@ int putchar (int c);
 int puts (char const *s);
 int remove (char const *file_name);
 void rewind (FILE * stream);
+void setbuf (FILE *stream, char *buf);
 int setvbuf (FILE * stream, char *buf, int mode, size_t size);
 int ungetc (int c, FILE * stream);
 long ftell (FILE * stream);