diff --git a/simbot-component-kook-api/src/commonMain/kotlin/love/forte/simbot/kook/api/asset/CreateAssetApi.kt b/simbot-component-kook-api/src/commonMain/kotlin/love/forte/simbot/kook/api/asset/CreateAssetApi.kt
index 26221e7a..3b382011 100644
--- a/simbot-component-kook-api/src/commonMain/kotlin/love/forte/simbot/kook/api/asset/CreateAssetApi.kt
+++ b/simbot-component-kook-api/src/commonMain/kotlin/love/forte/simbot/kook/api/asset/CreateAssetApi.kt
@@ -51,7 +51,7 @@ public class CreateAssetApi private constructor(
         private const val DEFAULT_FILENAME = "unknown-file"
         private const val ASSET_API_FORM_PROPERTY_NAME = "file"
         private val HEADERS = Headers.build {
-            append(HttpHeaders.ContentType, "form-data")
+            append(HttpHeaders.ContentType, ContentType.MultiPart.FormData)
         }
 
         /**