diff --git a/core-model/src/commonMain/kotlin/io/github/droidkaigi/confsched2022/model/TimetableItemId.kt b/core-model/src/commonMain/kotlin/io/github/droidkaigi/confsched2022/model/TimetableItemId.kt
index afb4c6e9f..57f898a3a 100644
--- a/core-model/src/commonMain/kotlin/io/github/droidkaigi/confsched2022/model/TimetableItemId.kt
+++ b/core-model/src/commonMain/kotlin/io/github/droidkaigi/confsched2022/model/TimetableItemId.kt
@@ -1,8 +1,6 @@
 package io.github.droidkaigi.confsched2022.model
 
-import kotlin.jvm.JvmInline
 import kotlinx.serialization.Serializable
 
 @Serializable
-@JvmInline
-value class TimetableItemId(val value: String)
+class TimetableItemId(val value: String)