diff --git a/support/biicode-build.py b/support/biicode-build.py
index 96d051ba..58c2893b 100755
--- a/support/biicode-build.py
+++ b/support/biicode-build.py
@@ -28,4 +28,5 @@ for f in glob.glob('support/biicode/*'):
   shutil.copy(f, cppformat_dir)
 env = os.environ.copy()
 env['PATH'] = os.path.abspath(os.path.dirname(cmake_program)) + ':' + env['PATH']
+env['CMAKE_ROOT'] = os.path.abspath(cmake_dir)
 check_call(['bii', 'cpp:build'], cwd=project_dir, env=env)