diff --git a/src/tests.rs b/src/tests.rs
index 028f0be..c2e3e00 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -17,7 +17,7 @@ fn test_load() {
 #[test]
 fn test_load_debug() {
     let lua = Lua::new();
-    lua.eval::<()>("debug", None).unwrap();
+    lua.exec::<()>("assert(debug == nil)", None).unwrap();
     unsafe {
         lua.load_debug();
     }