diff --git a/src/http/replay.ts b/src/http/replay.ts
index eba3287..1e44de7 100644
--- a/src/http/replay.ts
+++ b/src/http/replay.ts
@@ -46,7 +46,7 @@ async function writeMessagesToResponse(res: OutgoingMessage, replayOptions: Repl
   const BATCH_SIZE = 32
 
   // not 100% sure that's necessary since we're returning ndjson in fact, not json
-  res.setHeader('Content-Type', 'application/json')
+  res.setHeader('Content-Type', 'application/x-json-stream')
 
   let buffers: Buffer[] = []
   let totalMessagesCount = 0
diff --git a/src/http/replaynormalized.ts b/src/http/replaynormalized.ts
index 40cbb79..828b72e 100644
--- a/src/http/replaynormalized.ts
+++ b/src/http/replaynormalized.ts
@@ -43,7 +43,7 @@ export const replayNormalizedHttp = async (req: IncomingMessage, res: ServerResp
 async function writeMessagesToResponse(res: OutgoingMessage, options: ReplayNormalizedRequestOptions) {
   const BATCH_SIZE = 32
 
-  res.setHeader('Content-Type', 'application/json')
+  res.setHeader('Content-Type', 'application/x-json-stream')
 
   let buffers: string[] = []
   let totalMessagesCount = 0