diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 6cc2ca6333..0d3d9a6bf2 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -1375,6 +1375,14 @@
                     "limit_to_extruder": "wall_0_extruder_nr",
                     "settable_per_mesh": true
                 },
+                "fill_outline_gaps": {
+                    "label": "Print Thin Walls",
+                    "description": "Print pieces of the model which are horizontally thinner than the nozzle size.",
+                    "type": "bool",
+                    "default_value": false,
+                    "limit_to_extruder": "wall_0_extruder_nr",
+                    "settable_per_mesh": true
+                },
                 "min_feature_size":
                 {
                     "label": "Minimum Feature Size",