diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/tan/TanChallenge.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/tan/TanChallenge.kt
index 2946830b..18bc39fa 100644
--- a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/tan/TanChallenge.kt
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/tan/TanChallenge.kt
@@ -2,7 +2,6 @@ package net.codinux.banking.client.model.tan
 
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
-import kotlinx.datetime.LocalDateTime
 import net.codinux.banking.client.model.BankAccountViewInfo
 import net.codinux.banking.client.model.User
 import net.codinux.banking.client.model.BankViewInfo
@@ -51,7 +50,7 @@ open class TanChallenge(
      *
      * In server's time zone, that is Europe/Berlin.
      */
-    val tanExpirationTime: LocalDateTime? = null,
+    val tanExpirationTime: Instant? = null,
     val challengeCreationTimestamp: Instant = Clock.System.now()
 ) {