diff --git a/tests/liberty.c b/tests/liberty.c
index 3d932d5..92647ae 100644
--- a/tests/liberty.c
+++ b/tests/liberty.c
@@ -636,7 +636,7 @@ test_config_validate_nonnegative
 	return false;
 }
 
-static struct config_schema g_config_test[] =
+static const struct config_schema g_config_test[] =
 {
 	{ .name      = "foo",
 	  .comment   = "baz",