diff --git a/resources/definitions/makerbotreplicator.def.json b/resources/definitions/makerbotreplicator.def.json
index 9c49f301bd..d762db67fc 100644
--- a/resources/definitions/makerbotreplicator.def.json
+++ b/resources/definitions/makerbotreplicator.def.json
@@ -8,7 +8,7 @@
         "author": "Ultimaker",
         "manufacturer": "MakerBot",
         "category": "Other",
-        "file_formats": "text/x-gcode",
+        "file_formats": "application/x3g",
         "platform_offset": [ 0, 0, 0]
     },