diff --git a/src/pretix/base/views/metrics.py b/src/pretix/base/views/metrics.py
index c61e55352c..8df8591462 100644
--- a/src/pretix/base/views/metrics.py
+++ b/src/pretix/base/views/metrics.py
@@ -80,4 +80,4 @@ def serve_metrics(request):
 
     content = "\n".join(output) + "\n"
 
-    return HttpResponse(content)
+    return HttpResponse(content, content_type="text/plain;version=1.0.0;escaping=allow-utf-8")