diff --git a/quickjs.c b/quickjs.c
index bd9692e..e8e1ced 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -51869,6 +51869,15 @@ void JS_DetachArrayBuffer(JSContext *ctx, JSValueConst obj)
     }
 }
 
+int JS_IsArrayBuffer(JSContext *js, JSValueConst obj)
+{
+  JSObject *p;
+  if (JS_VALUE_GET_TAG(obj) != JS_TAG_OBJECT) return 0;
+  p = JS_VALUE_GET_OBJ(obj);
+  if (p->class_id != JS_CLASS_ARRAY_BUFFER && p->class_id != JS_CLASS_SHARED_ARRAY_BUFFER) return 0;
+  return 1;
+}
+
 /* get an ArrayBuffer or SharedArrayBuffer */
 static JSArrayBuffer *js_get_array_buffer(JSContext *ctx, JSValueConst obj)
 {
diff --git a/quickjs.h b/quickjs.h
index 05f2b55..b253069 100644
--- a/quickjs.h
+++ b/quickjs.h
@@ -947,6 +947,7 @@ JSValue JS_NewArrayBuffer(JSContext *ctx, uint8_t *buf, size_t len,
                           JS_BOOL is_shared);
 JSValue JS_NewArrayBufferCopy(JSContext *ctx, const uint8_t *buf, size_t len);
 void JS_DetachArrayBuffer(JSContext *ctx, JSValueConst obj);
+int JS_IsArrayBuffer(JSContext *js, JSValueConst obj);
 uint8_t *JS_GetArrayBuffer(JSContext *ctx, size_t *psize, JSValueConst obj);
 
 typedef enum JSTypedArrayEnum {