diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2f874982..7c23b8ab 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -4,6 +4,7 @@ set(
   app/core/controller.cc
   app/core/labeling.cc
   app/emu/emulator.cc
+  app/core/message.cc
 )
 
 set(