diff --git a/src/isolate.rs b/src/isolate.rs
index 9374f2af..2f92a699 100644
--- a/src/isolate.rs
+++ b/src/isolate.rs
@@ -100,7 +100,7 @@ pub enum WasmAsyncSuccess {
   Fail,
 }
 pub type WasmAsyncResolvePromiseCallback = extern "C" fn(
-  *const Isolate,
+  *mut Isolate,
   Local<Context>,
   Local<PromiseResolver>,
   Local<Value>,
diff --git a/src/lib.rs b/src/lib.rs
index 92034d57..c3f4f0b5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -107,6 +107,7 @@ pub use isolate::OwnedIsolate;
 pub use isolate::PromiseHook;
 pub use isolate::PromiseHookType;
 pub use isolate::PromiseRejectCallback;
+pub use isolate::WasmAsyncSuccess;
 pub use isolate_create_params::CreateParams;
 pub use module::*;
 pub use object::*;