diff --git a/tests/lib/custom_lib/prj.conf b/tests/lib/custom_lib/prj.conf
index b0d275a..f70c400 100644
--- a/tests/lib/custom_lib/prj.conf
+++ b/tests/lib/custom_lib/prj.conf
@@ -1,3 +1,2 @@
 CONFIG_ZTEST=y
-CONFIG_ZTEST_NEW_API=y
 CONFIG_CUSTOM_LIB=y