diff --git a/tests/cb_mux/app.config.test b/tests/cb_mux/app.config.test
new file mode 100644
index 0000000000..529b1b0c77
--- /dev/null
+++ b/tests/cb_mux/app.config.test
@@ -0,0 +1 @@
+CONFIG_MODULE_CB_MUX=y