diff --git a/src/3rdparty/openttd_social_integration_api/CMakeLists.txt b/src/3rdparty/openttd_social_integration_api/CMakeLists.txt
new file mode 100644
--- /dev/null
+++ b/src/3rdparty/openttd_social_integration_api/CMakeLists.txt
@@ -0,0 +1,4 @@
+add_files(
+    openttd_social_integration_api.h
+    openttd_social_integration_api_v1.h
+)