diff --git a/libnix/sources/headers/stdio.h b/libnix/sources/headers/stdio.h
index e2c0b33..418ceb4 100755
--- a/libnix/sources/headers/stdio.h
+++ b/libnix/sources/headers/stdio.h
@@ -83,6 +83,7 @@ extern long ftell(FILE *stream);
 extern int setvbuf(FILE *stream,char *buf,int mode,size_t size);
 extern int fread(void *,size_t,size_t,FILE *);
 extern int fwrite(const void *,size_t,size_t,FILE *);
+extern char *tmpnam(char *buf);
 
 /* More bsd headers compatibility */