diff --git a/src/octoprint/server/util/tornado.py b/src/octoprint/server/util/tornado.py
index e21a4dfd..b7610b07 100644
--- a/src/octoprint/server/util/tornado.py
+++ b/src/octoprint/server/util/tornado.py
@@ -207,7 +207,7 @@ class UploadStorageFallbackHandler(RequestlessExceptionLoggingMixin):
 			if self.is_multipart():
 				if not self._bytes_left:
 					# we don't support requests without a content-length
-					raise tornado.web.HTTPError(400, log_message="No Content-Length supplied")
+					raise tornado.web.HTTPError(411, log_message="No Content-Length supplied")
 
 				# extract the multipart boundary
 				fields = self._content_type.split(";")