diff --git a/tests/optimizer.rs b/tests/optimizer.rs
index 6e2c36d3..4d69d6ea 100644
--- a/tests/optimizer.rs
+++ b/tests/optimizer.rs
@@ -212,6 +212,7 @@ fn test_optimizer_full() -> Result<(), Box<EvalAltResult>> {
 
     let ast = engine.compile(SCRIPT)?;
 
+    #[cfg(feature = "internals")]
     assert_eq!(ast.statements().len(), 2);
 
     assert_eq!(engine.eval_ast_with_scope::<INT>(&mut scope, &ast)?, 42);