diff --git a/app/node/CMakeLists.txt b/app/node/CMakeLists.txt
index 43ac4ae4a..235d4b589 100644
--- a/app/node/CMakeLists.txt
+++ b/app/node/CMakeLists.txt
@@ -28,6 +28,8 @@ set(OLIVE_SOURCES
   node/dependency.cpp
   node/edge.h
   node/edge.cpp
+  node/external.h
+  node/external.cpp
   node/factory.h
   node/factory.cpp
   node/graph.h