diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/relation/DefaultRelationService.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/relation/DefaultRelationService.kt
index b5a0e50e..cd31c978 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/relation/DefaultRelationService.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/relation/DefaultRelationService.kt
@@ -115,7 +115,7 @@ internal class DefaultRelationService @Inject constructor(private val context: C
                 eventId,
                 reason)
         val redactWorkData = WorkerParamsFactory.toData(sendContentWorkerParams)
-        return TimelineSendEventWorkCommon.createWork<RedactEventWorker>(redactWorkData)
+        return TimelineSendEventWorkCommon.createWork<RedactEventWorker>(redactWorkData, true)
     }
 
     override fun editTextMessage(targetEventId: String,
@@ -199,14 +199,13 @@ internal class DefaultRelationService @Inject constructor(private val context: C
         // Same parameter
         val params = EncryptEventWorker.Params(credentials.userId, roomId, event, keepKeys)
         val sendWorkData = WorkerParamsFactory.toData(params)
-        return TimelineSendEventWorkCommon.createWork<EncryptEventWorker>(sendWorkData)
+        return TimelineSendEventWorkCommon.createWork<EncryptEventWorker>(sendWorkData, true)
     }
 
     private fun createSendEventWork(event: Event): OneTimeWorkRequest {
         val sendContentWorkerParams = SendEventWorker.Params(credentials.userId, roomId, event)
         val sendWorkData = WorkerParamsFactory.toData(sendContentWorkerParams)
-        val workRequest = TimelineSendEventWorkCommon.createWork<SendEventWorker>(sendWorkData)
-        return workRequest
+        return TimelineSendEventWorkCommon.createWork<SendEventWorker>(sendWorkData, true)
     }
 
     override fun getEventSummaryLive(eventId: String): LiveData<EventAnnotationsSummary> {
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/DefaultSendService.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/DefaultSendService.kt
index b4759c41..34260cb2 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/DefaultSendService.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/DefaultSendService.kt
@@ -80,11 +80,11 @@ internal class DefaultSendService @Inject constructor(private val context: Conte
         return if (cryptoService.isRoomEncrypted(roomId)) {
             Timber.v("Send event in encrypted room")
             val encryptWork = createEncryptEventWork(event, true)
-            val sendWork = createSendEventWork(event)
+            val sendWork = createSendEventWork(event, false)
             TimelineSendEventWorkCommon.postSequentialWorks(context, roomId, encryptWork, sendWork)
             CancelableWork(context, encryptWork.id)
         } else {
-            val sendWork = createSendEventWork(event)
+            val sendWork = createSendEventWork(event, true)
             TimelineSendEventWorkCommon.postWork(context, roomId, sendWork)
             CancelableWork(context, sendWork.id)
         }
@@ -245,7 +245,7 @@ internal class DefaultSendService @Inject constructor(private val context: Conte
         val isRoomEncrypted = cryptoService.isRoomEncrypted(roomId)
 
         val uploadWork = createUploadMediaWork(localEcho, attachment, isRoomEncrypted, startChain = true)
-        val sendWork = createSendEventWork(localEcho)
+        val sendWork = createSendEventWork(localEcho, false)
 
         if (isRoomEncrypted) {
             val encryptWork = createEncryptEventWork(localEcho, false /*not start of chain, take input error*/)
@@ -297,11 +297,11 @@ internal class DefaultSendService @Inject constructor(private val context: Conte
                 .build()
     }
 
-    private fun createSendEventWork(event: Event): OneTimeWorkRequest {
+    private fun createSendEventWork(event: Event, startChain: Boolean): OneTimeWorkRequest {
         val sendContentWorkerParams = SendEventWorker.Params(credentials.userId, roomId, event)
         val sendWorkData = WorkerParamsFactory.toData(sendContentWorkerParams)
 
-        return TimelineSendEventWorkCommon.createWork<SendEventWorker>(sendWorkData)
+        return TimelineSendEventWorkCommon.createWork<SendEventWorker>(sendWorkData, startChain)
     }
 
     private fun createRedactEventWork(event: Event, reason: String?): OneTimeWorkRequest {
@@ -310,7 +310,7 @@ internal class DefaultSendService @Inject constructor(private val context: Conte
         }
         val sendContentWorkerParams = RedactEventWorker.Params(credentials.userId, redactEvent.eventId!!, roomId, event.eventId, reason)
         val redactWorkData = WorkerParamsFactory.toData(sendContentWorkerParams)
-        return TimelineSendEventWorkCommon.createWork<RedactEventWorker>(redactWorkData)
+        return TimelineSendEventWorkCommon.createWork<RedactEventWorker>(redactWorkData, true)
     }
 
     private fun createUploadMediaWork(event: Event,
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/timeline/TimelineSendEventWorkCommon.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/timeline/TimelineSendEventWorkCommon.kt
index 2a72d3ff..71d6f5d4 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/timeline/TimelineSendEventWorkCommon.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/timeline/TimelineSendEventWorkCommon.kt
@@ -17,6 +17,7 @@ package im.vector.matrix.android.internal.session.room.timeline
 
 import android.content.Context
 import androidx.work.*
+import im.vector.matrix.android.internal.session.room.send.NoMerger
 import im.vector.matrix.android.internal.worker.WorkManagerUtil
 import im.vector.matrix.android.internal.worker.WorkManagerUtil.matrixOneTimeWorkRequestBuilder
 import java.util.concurrent.TimeUnit
@@ -57,9 +58,14 @@ internal object TimelineSendEventWorkCommon {
                 .enqueue()
     }
 
-    inline fun <reified W : ListenableWorker> createWork(data: Data): OneTimeWorkRequest {
+    inline fun <reified W : ListenableWorker> createWork(data: Data, startChain: Boolean): OneTimeWorkRequest {
         return matrixOneTimeWorkRequestBuilder<W>()
                 .setConstraints(WorkManagerUtil.workConstraints)
+                .apply {
+                    if (startChain) {
+                        setInputMerger(NoMerger::class.java)
+                    }
+                }
                 .setInputData(data)
                 .setBackoffCriteria(BackoffPolicy.LINEAR, BACKOFF_DELAY, TimeUnit.MILLISECONDS)
                 .build()
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/worker/Extensions.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/worker/Extensions.kt
new file mode 100644
index 00000000..28630395
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/worker/Extensions.kt
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2019 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.matrix.android.internal.worker
+