diff --git a/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebApp.kt b/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebApp.kt
index f205ae37e9..80fe5bff2d 100644
--- a/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebApp.kt
+++ b/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebApp.kt
@@ -102,7 +102,7 @@ external class WebApp {
     fun openTelegramLink(url: String)
     fun openInvoice(url: String, callback: (InvoiceClosedInfo) -> Unit = definedExternally)
 
-    fun shareToStory(mediaUrl: String, params: StoryShareParams?)
+    fun shareToStory(mediaUrl: String, params: StoryShareParams? = definedExternally)
 
     fun requestWriteAccess(callback: ((Boolean) -> Unit)? = definedExternally)
     fun requestContact(callback: ((Boolean) -> Unit)? = definedExternally)