diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 992424db46..563ac957e4 100755
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -4371,7 +4371,7 @@
                             "unit": "mm",
                             "type": "float",
                             "default_value": 2,
-                            "value": "round(max(2 * max(extruderValues('prime_tower_line_width')), 0.5 * (resolveOrValue('prime_tower_size') - math.sqrt(max(0, resolveOrValue('prime_tower_size') ** 2 - max(extruderValues('prime_tower_min_volume')) / resolveOrValue('layer_height'))))), 3)",
+                            "value": "round(max(2 * prime_tower_line_width, 0.5 * (prime_tower_size - math.sqrt(max(0, prime_tower_size ** 2 - prime_tower_min_volume / layer_height)))), 3)",
                             "resolve": "max(extruderValues('prime_tower_wall_thickness'))",
                             "minimum_value": "0.001",
                             "minimum_value_warning": "2 * min(extruderValues('prime_tower_line_width')) - 0.0001",