diff --git a/gio/tests/gdbus-testserver.c b/gio/tests/gdbus-testserver.c
index dd0d5ba5a..a0efccdc5 100644
--- a/gio/tests/gdbus-testserver.c
+++ b/gio/tests/gdbus-testserver.c
@@ -322,7 +322,7 @@ handle_method_call (GDBusConnection       *connection,
       const guint64 *uint64s;
       const gdouble *doubles;
       gsize n_elts;
-      gint i, j;
+      gsize i, j;
       GVariantBuilder ret;
 
       g_variant_builder_init (&ret, G_VARIANT_TYPE ("(ayabanaqaiauaxatad)"));