diff --git a/glib/tests/tree.c b/glib/tests/tree.c
index 5bf7bd368..8811d962d 100644
--- a/glib/tests/tree.c
+++ b/glib/tests/tree.c
@@ -333,7 +333,7 @@ static void
 test_tree_traverse (void)
 {
   GTree *tree;
-  gint i;
+  gsize i;
   TraverseData orders[] = {
     { G_IN_ORDER,   -1, "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" },
     { G_IN_ORDER,    1, "0" },