diff --git a/src/tools/testwrap b/src/tools/testwrap
index 8ae8fb79ba7..21c489a5beb 100755
--- a/src/tools/testwrap
+++ b/src/tools/testwrap
@@ -39,6 +39,7 @@ os.chdir(args.srcdir)
 open(os.path.join(testdir, 'test.start'), 'x')
 
 env_dict = {**os.environ,
+            'MESON_BUILD_ROOT': args.basedir,
             'TESTDATADIR': os.path.join(testdir, 'data'),
             'TESTLOGDIR': os.path.join(testdir, 'log')}