diff --git a/ChangeLog b/ChangeLog
index 6dde9a7e113c2093fad70b4698a15aac7e281771..82ac9c2d1146eab3eb7bb1f7c6489f1a58e37744 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-05-02  Niels Möller  <nisse@lysator.liu.se>
+
+	* sexp-format.c (sexp_vformat): Use type mpz_srcptr rather
+	than the old MP_INT *.
+
 2013-04-26  Niels Möller  <nisse@lysator.liu.se>
 
 	* Many files: Use size_t rather than unsigned for data sizes.
diff --git a/sexp-format.c b/sexp-format.c
index 548c5f1ddb5db9bc348d801af56626ecfe68bbf0..329bb0d8b471a8460092ce1628f4909ac900111d 100644
--- a/sexp-format.c
+++ b/sexp-format.c
@@ -290,7 +290,7 @@ sexp_vformat(struct nettle_buffer *buffer, const char *format, va_list args)
 	      }
 	    case 'b':
 	      {
-		const MP_INT *n = va_arg(args, const MP_INT *);
+		mpz_srcptr n = va_arg(args, mpz_srcptr);
 		size_t length;
 		unsigned prefix_length;