diff --git a/test/types/pino.test-d.ts b/test/types/pino.test-d.ts
index dbfd0852d..6ae04f542 100644
--- a/test/types/pino.test-d.ts
+++ b/test/types/pino.test-d.ts
@@ -329,3 +329,15 @@ pino({
     crlf: true,
 });
 
+const customLevels = { foo: 99 };
+
+const customLevelLogger = pino({ customLevels });
+
+type CustomLevelLogger = typeof customLevelLogger
+type CustomLevelLoggerLevels = pino.Level | keyof typeof customLevels
+
+const fn = (logger: Pick<CustomLevelLogger, CustomLevelLoggerLevels>) => {}
+
+const customLevelChildLogger = customLevelLogger.child({ name: "child" })
+
+fn(customLevelChildLogger); // missing foo typing