diff --git a/ChangeLog b/ChangeLog
index 5672ce8df..6a1bb10c1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-07-24  Tor Lillqvist  <tml@novell.com>
+
+	* glib/gslice.c (smc_notify_free): Use G_GSIZE_FORMAT instead of
+	the C99 "zu".
+
 2008-07-24  Tor Lillqvist  <tml@novell.com>
 
 	* configure.in: Must output the GLIB_USING_SYSTEM_PRINTF to
diff --git a/glib/gslice.c b/glib/gslice.c
index 5bad65e53..70f9efa68 100644
--- a/glib/gslice.c
+++ b/glib/gslice.c
@@ -1245,17 +1245,17 @@ smc_notify_free (void   *pointer,
   found_one = smc_tree_lookup (adress, &real_size);
   if (!found_one)
     {
-      fprintf (stderr, "GSlice: MemChecker: attempt to release non-allocated block: %p size=%zu\n", pointer, size);
+      fprintf (stderr, "GSlice: MemChecker: attempt to release non-allocated block: %p size=%" G_GSIZE_FORMAT "\n", pointer, size);
       return 0;
     }
   if (real_size != size && (real_size || size))
     {
-      fprintf (stderr, "GSlice: MemChecker: attempt to release block with invalid size: %p size=%zu invalid-size=%zu\n", pointer, real_size, size);
+      fprintf (stderr, "GSlice: MemChecker: attempt to release block with invalid size: %p size=%" G_GSIZE_FORMAT " invalid-size=%" G_GSIZE_FORMAT "\n", pointer, real_size, size);
       return 0;
     }
   if (!smc_tree_remove (adress))
     {
-      fprintf (stderr, "GSlice: MemChecker: attempt to release non-allocated block: %p size=%zu\n", pointer, size);
+      fprintf (stderr, "GSlice: MemChecker: attempt to release non-allocated block: %p size=%" G_GSIZE_FORMAT "\n", pointer, size);
       return 0;
     }
   return 1; /* all fine */