diff --git a/app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt b/app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt
index 82d15f7c..1afb3e1c 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt
@@ -33,7 +33,7 @@ class CallHistoryNew(val aor: String, val peerUri: String, val direction: String
     companion object {
 
         @Suppress("unused")
-        private const val serialVersionUID: Long = 3
+        const val serialVersionUID: Long = 3L
         private const val CALL_HISTORY_SIZE = 256
 
         fun aorLatestPeerUri(aor: String): String? {
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
index 267a098f..8a60f7fe 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
@@ -669,7 +669,7 @@ object Utils {
     class Crypto(val salt: ByteArray, val iter: Int, val iv: ByteArray, val data: ByteArray): Serializable {
         companion object {
             @Suppress("unused")
-            private const val serialVersionUID: Long = -29238082928391L
+            const val serialVersionUID: Long = -29238082928391L
         }
     }