diff --git a/addons/cmake_project.py b/addons/cmake_project.py
index 0a1b306..97c1236 100644
--- a/addons/cmake_project.py
+++ b/addons/cmake_project.py
@@ -105,6 +105,7 @@ def _cmake_project(env: Environment, project_root: str, generate_args: 'list[str
             libpath.append(full_path)
 
     return {
+        'build_dir': build_dir,
         'install_dir': install_dir,
         'BINPATH': [os.path.join(install_dir, 'bin')],
         'LIBPATH': libpath,