diff --git a/tests/unit/pot/prj.conf b/tests/unit/pot/prj.conf
index 3aff91ca987..910bd8dc806 100644
--- a/tests/unit/pot/prj.conf
+++ b/tests/unit/pot/prj.conf
@@ -2,3 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
 CONFIG_ZTEST=y
+
+CONFIG_CPP=y