diff --git a/src/chat/notification/imdn.cpp b/src/chat/notification/imdn.cpp
index 203eb7846..27b4776b0 100644
--- a/src/chat/notification/imdn.cpp
+++ b/src/chat/notification/imdn.cpp
@@ -165,6 +165,7 @@ void Imdn::startTimer () {
 		timer = chatRoom->getCore()->getCCore()->sal->create_timer(timerExpired, this, duration, "imdn timeout");
 	else
 		belle_sip_source_set_timeout(timer, duration);
+	bgTask.start(chatRoom->getCore(), 1);
 }
 
 void Imdn::stopTimer () {
@@ -175,6 +176,7 @@ void Imdn::stopTimer () {
 		belle_sip_object_unref(timer);
 		timer = nullptr;
 	}
+	bgTask.stop();
 }
 
 LINPHONE_END_NAMESPACE
diff --git a/src/chat/notification/imdn.h b/src/chat/notification/imdn.h
index ca5095319..e9b8c633b 100644
--- a/src/chat/notification/imdn.h
+++ b/src/chat/notification/imdn.h
@@ -22,6 +22,8 @@
 
 #include "linphone/utils/general.h"
 
+#include "utils/background-task.h"
+
 #include "private.h"
 
 // =============================================================================
@@ -69,6 +71,7 @@ private:
 	std::list<const std::shared_ptr<ChatMessage>> displayedMessages;
 	std::list<MessageReason> nonDeliveredMessages;
 	belle_sip_source_t *timer = nullptr;
+	BackgroundTask bgTask { "IMDN sending" };
 };
 
 LINPHONE_END_NAMESPACE