diff --git a/app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt b/app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt
index 3c9b4f60..b2367fac 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt
@@ -1,7 +1,12 @@
 package com.tutpro.baresip
 
-import java.io.*
-import java.util.ArrayList
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.io.IOException
+import java.io.ObjectInputStream
+import java.io.ObjectOutputStream
+import java.io.Serializable
 import java.util.GregorianCalendar
 
 class CallHistoryNew(val aor: String, val peerUri: String, val direction: String) : Serializable {