diff --git a/src/index.ts b/src/index.ts
index bf811a2..4de9153 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,7 +4,7 @@ import {bls as blsHerumi} from "./herumi";
 export type Implementation = "herumi" | "blst-native";
 
 // TODO: Use a Proxy for example to throw an error if it's not initialized yet
-export let bls: IBls;
+export const bls: IBls = {} as IBls;
 
 async function getImplementation(impl: Implementation = "herumi"): Promise<IBls> {
   switch (impl) {
@@ -13,11 +13,12 @@ async function getImplementation(impl: Implementation = "herumi"): Promise<IBls>
       return blsHerumi;
 
     case "blst-native":
+      // Lazy import native bindings to prevent automatically importing binding.node files
       if (typeof require !== "function") {
         throw Error("blst-native is only supported in NodeJS");
       }
       // eslint-disable-next-line @typescript-eslint/no-require-imports
-      return require("./blst");
+      return require("./blst").bls;
 
     default:
       throw new Error(`Unsupported implementation - ${impl}`);
@@ -25,7 +26,10 @@ async function getImplementation(impl: Implementation = "herumi"): Promise<IBls>
 }
 
 export async function init(impl: Implementation): Promise<void> {
-  bls = await getImplementation(impl);
+  // Using Object.assign instead of just bls = getImplementation()
+  // because otherwise the default import breaks. The reference is lost
+  // and the imported object is still undefined after calling init()
+  Object.assign(bls, await getImplementation(impl));
 }
 
 export default bls;