diff --git a/raven/contrib/flask.py b/raven/contrib/flask.py
index 40c7fb3b5..bfdec1e47 100644
--- a/raven/contrib/flask.py
+++ b/raven/contrib/flask.py
@@ -193,7 +193,7 @@ def get_http_info(self, request):
         return self.get_http_info_with_retriever(request, retriever)
 
     def is_json_type(self, content_type):
-        return content_type == 'application/json'
+        return content_type == 'application/json' or content_type.endswith('+json')
 
     def get_form_data(self, request):
         return request.form