diff --git a/test/unit/cpp/CMakeLists.txt b/test/unit/cpp/CMakeLists.txt
index a9d36f73b5a17fdb810a3fddd4ef4b9b97f1c345..ab2d7202cd174d1274ab0dc1a21498d49cee4a20 100644
--- a/test/unit/cpp/CMakeLists.txt
+++ b/test/unit/cpp/CMakeLists.txt
@@ -3,6 +3,6 @@
 # SPDX-FileCopyrightText: (C) 2022 Jayesh Badwaik <j.badwaik@fz-juelich.de>
 # --------------------------------------------------------------------------------------------------
 
-add_unit_test_directory(nola libtestzell unit_test)
-add_unit_test_directory(zell libtestzell unit_test)
-add_unit_test_directory(testzell libtestzell unit_test)
+add_unit_test_directory(nola libtestzell cpp unit_test)
+add_unit_test_directory(zell libtestzell cpp unit_test)
+add_unit_test_directory(testzell libtestzell cpp unit_test)