diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 37ef512f3d..aa871ed338 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -2041,7 +2041,7 @@
                     "minimum_value": "0",
                     "maximum_value": "machine_height",
                     "type": "float",
-                    "value": "resolveOrValue('infill_sparse_thickness') * 4 if infill_sparse_density < 50 else 0",
+                    "value": "resolveOrValue('infill_sparse_thickness') * (4 if infill_sparse_density < 50 else 1)",
                     "limit_to_extruder": "infill_extruder_nr",
                     "enabled": "infill_sparse_density > 0",
                     "settable_per_mesh": true,