diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/chat/members/SetChatAdministratorCustomTitle.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/chat/members/SetChatAdministratorCustomTitle.kt
index 1adafd2c34..9cfcfd2208 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/chat/members/SetChatAdministratorCustomTitle.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/chat/members/SetChatAdministratorCustomTitle.kt
@@ -18,7 +18,7 @@ data class SetChatAdministratorCustomTitle(
     override val resultDeserializer: DeserializationStrategy<Boolean>
         get() = Boolean.serializer()
     override val requestSerializer: SerializationStrategy<*>
-        get() = RestrictChatMember.serializer()
+        get() = serializer()
 
     init {
         if (customTitle.length !in customTitleLength) {