diff --git a/files/CMakeLists.txt b/files/CMakeLists.txt
index 587c3fa1d3..9461879d61 100644
--- a/files/CMakeLists.txt
+++ b/files/CMakeLists.txt
@@ -2,4 +2,8 @@ add_subdirectory(shaders)
 add_subdirectory(data)
 add_subdirectory(lua_api)
 
+if (NOT DEFINED OPENMW_RESOURCES_ROOT)
+    return()
+endif()
+
 copy_resource_file("launcher/images/openmw.png" "${OPENMW_RESOURCES_ROOT}" "resources/openmw.png")