diff --git a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ConversationsAdapter.kt b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ConversationsAdapter.kt
index c895ea85..dd1d60e2 100644
--- a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ConversationsAdapter.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ConversationsAdapter.kt
@@ -23,8 +23,10 @@ import com.simplemobiletools.commons.views.MyRecyclerView
 import com.simplemobiletools.smsmessenger.R
 import com.simplemobiletools.smsmessenger.activities.SimpleActivity
 import com.simplemobiletools.smsmessenger.extensions.deleteConversation
+import com.simplemobiletools.smsmessenger.extensions.markThreadMessagesUnread
 import com.simplemobiletools.smsmessenger.helpers.refreshMessages
 import com.simplemobiletools.smsmessenger.models.Conversation
+import com.simplemobiletools.smsmessenger.models.Events
 import kotlinx.android.synthetic.main.item_conversation.view.*
 
 class ConversationsAdapter(
@@ -60,6 +62,7 @@ class ConversationsAdapter(
             R.id.cab_copy_number -> copyNumberToClipboard()
             R.id.cab_delete -> askConfirmDelete()
             R.id.cab_select_all -> selectAll()
+            R.id.cab_mark_as_unread -> markAsUnread()
         }
     }
 
@@ -184,6 +187,23 @@ class ConversationsAdapter(
         }
     }
 
+    private fun markAsUnread() {
+        if (selectedKeys.isEmpty()) {
+            return
+        }
+        val conversationsMarkedAsUnread = conversations.filter { selectedKeys.contains(it.hashCode()) } as ArrayList<Conversation>
+        ensureBackgroundThread {
+            conversationsMarkedAsUnread.filter { conversation -> conversation.read }.forEach {
+                activity.markThreadMessagesUnread(it.threadId)
+            }
+
+            activity.runOnUiThread {
+                refreshMessages()
+                finishActMode()
+            }
+        }
+    }
+
     private fun addNumberToContact() {
         val conversation = getSelectedItems().firstOrNull() ?: return
         Intent().apply {
diff --git a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt
index 97c1b874..135c6eb2 100644
--- a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt
@@ -30,8 +30,10 @@ import com.simplemobiletools.commons.views.FastScroller
 import com.simplemobiletools.commons.views.MyRecyclerView
 import com.simplemobiletools.smsmessenger.R
 import com.simplemobiletools.smsmessenger.activities.SimpleActivity
+import com.simplemobiletools.smsmessenger.activities.ThreadActivity
 import com.simplemobiletools.smsmessenger.dialogs.SelectTextDialog
 import com.simplemobiletools.smsmessenger.extensions.deleteMessage
+import com.simplemobiletools.smsmessenger.extensions.updateLastConversationMessage
 import com.simplemobiletools.smsmessenger.helpers.*
 import com.simplemobiletools.smsmessenger.models.*
 import kotlinx.android.synthetic.main.item_attachment_image.view.*
@@ -181,10 +183,12 @@ class ThreadAdapter(
 
         val messagesToRemove = getSelectedItems()
         val positions = getSelectedItemPositions()
+        val threadId = (messagesToRemove[0] as Message).threadId
         messagesToRemove.forEach {
             activity.deleteMessage((it as Message).id, it.isMMS)
         }
         messages.removeAll(messagesToRemove)
+        activity.updateLastConversationMessage(threadId)
 
         activity.runOnUiThread {
             if (messages.filter { it is Message }.isEmpty()) {
diff --git a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/Context.kt b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/Context.kt
index dc51d437..0758d60d 100644
--- a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/Context.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/Context.kt
@@ -775,3 +775,15 @@ fun Context.removeDiacriticsIfNeeded(text: String): String {
 
     return msg
 }
+
+fun Context.updateLastConversationMessage(threadId: Long) {
+    val uri = Threads.CONTENT_URI
+    val selection = "${Threads._ID} = ?"
+    val selectionArgs = arrayOf(threadId.toString())
+    try {
+        contentResolver.delete(uri, selection, selectionArgs)
+        val newConversation = getConversations(threadId)[0]
+        conversationsDB.insertOrUpdate(newConversation)
+    } catch (e: Exception) {
+    }
+}
diff --git a/app/src/main/res/menu/cab_conversations.xml b/app/src/main/res/menu/cab_conversations.xml
index 2be314f3..a596dbb3 100644
--- a/app/src/main/res/menu/cab_conversations.xml
+++ b/app/src/main/res/menu/cab_conversations.xml
@@ -25,6 +25,10 @@
         android:id="@+id/cab_copy_number"
         android:title="@string/copy_number_to_clipboard"
         app:showAsAction="never" />
+    <item
+        android:id="@+id/cab_mark_as_unread"
+        android:title="@string/mark_as_unread"
+        app:showAsAction="never" />
     <item
         android:id="@+id/cab_select_all"
         android:title="@string/select_all"