diff --git a/src/message.rs b/src/message.rs
index 3d1cf4750..2a4c206b2 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -107,8 +107,7 @@ mod tests {
         let result: *const Object = unsafe {
             msg_send![obj, self]
         };
-        let obj_ptr: *const Object = &*obj;
-        assert!(result == obj_ptr);
+        assert!(result == &*obj);
     }
 
     #[test]
@@ -146,9 +145,12 @@ mod tests {
         let superclass = test_utils::custom_class();
         unsafe {
             let _: () = msg_send![obj, setFoo:4u32];
-            assert!(msg_send![super(obj, superclass), foo] == 4u32);
+            let foo: u32 = msg_send![super(obj, superclass), foo];
+            assert!(foo == 4);
+
             // The subclass is overriden to return foo + 2
-            assert!(msg_send![obj, foo] == 6u32);
+            let foo: u32 = msg_send![obj, foo];
+            assert!(foo == 6);
         }
     }
 }
diff --git a/src/runtime.rs b/src/runtime.rs
index 7cf7c3d15..4c773d408 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -470,8 +470,7 @@ mod tests {
         let cls = Class::get("NSObject").unwrap();
         let obj = test_utils::sample_object();
         assert!(obj.class() == cls);
-        let isa = unsafe { *obj.get_ivar("isa") };
-        let cls_ptr: *const Class = cls;
-        assert!(isa == cls_ptr);
+        let isa: *const Class = unsafe { *obj.get_ivar("isa") };
+        assert!(isa == cls);
     }
 }
diff --git a/src/test_utils.rs b/src/test_utils.rs
index b7900343b..bfa0e12bc 100644
--- a/src/test_utils.rs
+++ b/src/test_utils.rs
@@ -118,7 +118,7 @@ pub fn custom_subclass() -> &'static Class {
         let mut decl = ClassDecl::new(superclass, "CustomSubclassObject").unwrap();
 
         extern fn custom_subclass_get_foo(this: &Object, _cmd: Sel) -> u32 {
-            let foo = unsafe {
+            let foo: u32 = unsafe {
                 msg_send![super(this, custom_class()), foo]
             };
             foo + 2