diff --git a/thermion_dart/native/web/CMakeLists.txt b/thermion_dart/native/web/CMakeLists.txt
index 1fe65068..8ff7af04 100644
--- a/thermion_dart/native/web/CMakeLists.txt
+++ b/thermion_dart/native/web/CMakeLists.txt
@@ -56,6 +56,7 @@ add_executable(${MODULE_NAME}
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/ThermionDartApi.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/ThermionDartFFIApi.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/Gizmo.cpp"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../src/GridOverlay.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/StreamBufferAdapter.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/TimeIt.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/camutils/Manipulator.cpp"