diff --git a/tests/native.rs b/tests/native.rs
index ac5c75b1..eed7b956 100644
--- a/tests/native.rs
+++ b/tests/native.rs
@@ -77,11 +77,19 @@ fn test_native_overload() -> Result<(), Box<EvalAltResult>> {
 
     assert_eq!(
         engine.eval::<String>(r#"let x = "hello"; let y = "world"; x + y"#)?,
-        "hello***world"
+        if cfg!(not(feature = "fast_ops")) {
+            "hello***world"
+        } else {
+            "helloworld"
+        }
     );
     assert_eq!(
         engine.eval::<String>(r#"let x = "hello"; let y = (); x + y"#)?,
-        "hello Foo!"
+        if cfg!(not(feature = "fast_ops")) {
+            "hello Foo!"
+        } else {
+            "hello"
+        }
     );
 
     Ok(())
diff --git a/tests/plugins.rs b/tests/plugins.rs
index 9186f59c..a7912a0a 100644
--- a/tests/plugins.rs
+++ b/tests/plugins.rs
@@ -80,6 +80,7 @@ macro_rules! expand_enum {
         #[export_module]
         pub mod $module {
             $(
+                #[allow(non_upper_case_globals)]
                 pub const $variant: $typ = <$typ>::$variant;
             )*
         }
@@ -127,7 +128,14 @@ fn test_plugins_package() -> Result<(), Box<EvalAltResult>> {
     assert_eq!(engine.eval::<INT>("let a = [1, 2, 3]; test(a, 2)")?, 6);
     assert_eq!(engine.eval::<INT>("let a = [1, 2, 3]; hi(a, 2)")?, 6);
     assert_eq!(engine.eval::<INT>("let a = [1, 2, 3]; test(a, 2)")?, 6);
-    assert_eq!(engine.eval::<INT>("2 + 2")?, 5);
+    assert_eq!(
+        engine.eval::<INT>("2 + 2")?,
+        if cfg!(not(feature = "fast_ops")) {
+            5
+        } else {
+            4
+        }
+    );
     assert_eq!(
         engine.eval::<String>("let a = [1, 2, 3]; greet(test(a, 2))")?,
         "6 kitties"