diff --git a/quart/app.py b/quart/app.py
index <HASH>..<HASH> 100644
--- a/quart/app.py
+++ b/quart/app.py
@@ -1156,7 +1156,7 @@ class Quart(PackageStatic):
             status = status_or_headers
 
         if not isinstance(value, Response):
-            response = self.response_class(value, content_type='text/html')
+            response = self.response_class(value)
         else:
             response = value
Bugfix stop setting the content-type in make_response

It should be using the defaults or set explicitly in the
ResponseReturnValue.