diff --git a/src/main/java/org/asamk/signal/http/HttpServerHandler.java b/src/main/java/org/asamk/signal/http/HttpServerHandler.java
index f6301e0a..a5213df7 100644
--- a/src/main/java/org/asamk/signal/http/HttpServerHandler.java
+++ b/src/main/java/org/asamk/signal/http/HttpServerHandler.java
@@ -59,7 +59,7 @@ public class HttpServerHandler {
 
             httpExchange.getResponseBody().write(byteResponse);
         } else {
-            httpExchange.sendResponseHeaders(status, 0);
+            httpExchange.sendResponseHeaders(status, -1);
         }
 
         httpExchange.getResponseBody().close();