diff --git a/src/kits/app/app.src b/src/kits/app/app.src
index f7755de2dc..cc1c5f079f 100644
--- a/src/kits/app/app.src
+++ b/src/kits/app/app.src
@@ -9,6 +9,7 @@ APP_KIT_SOURCE =
 	LooperList.cpp
 	MessageFilter.cpp
 	MessageQueue.cpp
+	MessageRunner.cpp
 	Messenger.cpp
 	PropertyInfo.cpp
 	PortLink.cpp