diff --git a/src/entity_manager/meson.build b/src/entity_manager/meson.build
index 200c9f9..c55a6a8 100644
--- a/src/entity_manager/meson.build
+++ b/src/entity_manager/meson.build
@@ -19,6 +19,7 @@
     'topology.cpp',
     'utils.cpp',
     '../utils.cpp',
+    'main.cpp',
     cpp_args: cpp_args_em,
     dependencies: [
         boost,