diff --git a/tests/optimizer.rs b/tests/optimizer.rs
index dc25ab23..ac2d5f7f 100644
--- a/tests/optimizer.rs
+++ b/tests/optimizer.rs
@@ -7,6 +7,7 @@ fn test_optimizer() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new();
     engine.set_optimization_level(OptimizationLevel::Full);
 
+    #[cfg(not(feature = "no_function"))]
     assert_eq!(
         engine.eval::<INT>(
             "