diff --git a/TelegramBotAPI/src/commonTest/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/ChatIdentifierTests.kt b/TelegramBotAPI/src/commonTest/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/ChatIdentifierTests.kt
index bcf6f87870..68654a45e4 100644
--- a/TelegramBotAPI/src/commonTest/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/ChatIdentifierTests.kt
+++ b/TelegramBotAPI/src/commonTest/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/ChatIdentifierTests.kt
@@ -1,5 +1,6 @@
 package com.github.insanusmokrassar.TelegramBotAPI.types
 
+import com.github.insanusmokrassar.TelegramBotAPI.utils.nonstrictJsonFormat
 import kotlinx.serialization.ImplicitReflectionSerializer
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
@@ -54,25 +55,25 @@ class ChatIdentifierTests {
         )
 
         Example(chatIdentifierChatId.toChatId()).let { withChatId ->
-            val stringified = Json.plain.stringify(Example.serializer(), withChatId)
+            val stringified = nonstrictJsonFormat.stringify(Example.serializer(), withChatId)
             assertEquals(stringified, "{\"identifier\":$chatIdentifierChatId}")
-            val deserialized = Json.plain.parse(Example.serializer(), stringified)
+            val deserialized = nonstrictJsonFormat.parse(Example.serializer(), stringified)
             assertEquals(withChatId, deserialized)
         }
 
         Example(testUsername.toUsername()).let { withUsername ->
-            val stringified = Json.plain.stringify(Example.serializer(), withUsername)
+            val stringified = nonstrictJsonFormat.stringify(Example.serializer(), withUsername)
             assertEquals(stringified, "{\"identifier\":\"$testUsername\"}")
-            val deserialized = Json.plain.parse(Example.serializer(), stringified)
+            val deserialized = nonstrictJsonFormat.parse(Example.serializer(), stringified)
             assertEquals(withUsername, deserialized)
         }
 
         // Replace @ by empty string, because from time to time we can retrieve from Telegram system
         // username without starting @ symbol
         Example(testUsername.toUsername()).let { withUsername ->
-            val stringified = Json.plain.stringify(Example.serializer(), withUsername).replace("@", "")
+            val stringified = nonstrictJsonFormat.stringify(Example.serializer(), withUsername).replace("@", "")
             assertEquals("{\"identifier\":\"${testUsername.replace("@", "")}\"}", stringified)
-            val deserialized = Json.plain.parse(Example.serializer(), stringified)
+            val deserialized = nonstrictJsonFormat.parse(Example.serializer(), stringified)
             assertEquals(withUsername, deserialized)
         }
     }