diff --git a/api/s5/s5.go b/api/s5/s5.go
index d33da92..10d356f 100644
--- a/api/s5/s5.go
+++ b/api/s5/s5.go
@@ -403,6 +403,7 @@ func BuildTusCors() func(h http.Handler) http.Handler {
 				"Tus-Extension",
 				"Tus-Max-Size",
 				"X-HTTP-Method-Override",
+				"Content-Type",
 			},
 			AllowCredentials: true,
 		})