diff --git a/types/pino-http/index.d.ts b/types/pino-http/index.d.ts
index d78edbbabe..b47c95a2b9 100644
--- a/types/pino-http/index.d.ts
+++ b/types/pino-http/index.d.ts
@@ -15,12 +15,15 @@ declare function PinoHttp(stream?: DestinationStream): PinoHttp.HttpLogger;
 declare namespace PinoHttp {
     type HttpLogger = (req: IncomingMessage, res: ServerResponse) => void;
 
+    // When we upgrade to TypeScript 3.0, we can use `unknown`.
+    type PoorMansUnknown = {} | null | undefined;
+
     interface Options extends LoggerOptions {
         logger?: Logger;
         genReqId?: GenReqId;
         useLevel?: Level;
         stream?: DestinationStream;
-        customLogLevel?: (res: ServerResponse, error: unknown) => Level
+        customLogLevel?: (res: ServerResponse, error: PoorMansUnknown) => Level
     }
 
     interface GenReqId {