diff --git a/src/index.ts b/src/index.ts
index fc70958..ea9832d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -5,7 +5,9 @@ import { AbstractClass, AbstractConstructor, Opaque, UnionToIntersection } from
  * Represents the static members of a class.
  * @template C - The class type.
  */
-export type StaticMembers<C> = Pick<C, keyof C>
+export type StaticMembers<C> = {
+    [Key in keyof C as Key extends "prototype" ? never : Key]: C[Key]
+}
 
 
 /**
diff --git a/src/tests.ts b/src/tests.ts
index 37e9412..30e12c5 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -1,4 +1,4 @@
-import { expresses, trait } from "."
+import { expresses, extendsAndExpresses, trait } from "."
 
 
 const Identifiable = <ID>() =>
@@ -21,8 +21,13 @@ const Identifiable = <ID>() =>
 
 const ImplementsIdentifiable = <ID>(defaultID: ID) =>
     trait(Parent => {
-        abstract class ImplementsIdentifiable extends Identifiable<ID>()(Parent) {
+        abstract class ImplementsIdentifiable extends extendsAndExpresses(Parent, [Identifiable<ID>()]) {
             id: ID = defaultID
+
+            constructor(...args: any[]) {
+                super(...args)
+                console.log("ImplementsIdentifiable constructor")
+            }
         }
 
         return ImplementsIdentifiable