diff --git a/src/lisp.h b/src/lisp.h
index 447912581d7..85de57b0b2f 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -5086,8 +5086,9 @@ extern int emacs_open (const char *, int, int);
 extern int emacs_open_noquit (const char *, int, int);
 extern int emacs_pipe (int[2]);
 extern int emacs_close (int);
-extern FILE *emacs_fdopen (int, const char *);
 extern int emacs_fclose (FILE *);
+extern FILE *emacs_fdopen (int, const char *)
+  ATTRIBUTE_MALLOC ATTRIBUTE_DEALLOC (emacs_fclose, 1);
 extern int emacs_unlink (const char *);
 extern int emacs_symlink (const char *, const char *);
 extern int emacs_rmdir (const char *);