diff --git a/packages/better-auth/tsup.config.ts b/packages/better-auth/tsup.config.ts
index 423c30fbf7..cd2edab91c 100644
--- a/packages/better-auth/tsup.config.ts
+++ b/packages/better-auth/tsup.config.ts
@@ -30,6 +30,8 @@ export default defineConfig((env) => {
 		},
 		format: ["esm", "cjs"],
 		bundle: true,
+		splitting: true,
 		skipNodeModulesBundle: true,
+		noExternal: ["better-call", "@better-fetch/fetch"],
 	};
 });