diff --git a/tests/test_terrain.gd b/tests/test_terrain.gd
index c70c48e..86da415 100644
--- a/tests/test_terrain.gd
+++ b/tests/test_terrain.gd
@@ -101,7 +101,7 @@ func _test_brush_smooth() -> void:
 	var moved := false
 	for pass_i in 2:
 		moved = TerrainField.apply_brush(heights, res, size, size, 0.0, 100.0,
-				160.0, 160.0, 60.0, TerrainField.Mode.SMOOTH, 1.0) or moved
+				0.0, 0.0, 60.0, TerrainField.Mode.SMOOTH, 1.0) or moved
 	_check(moved, "Glätten: Feld wurde verändert")
 	var variance_after := _variance_block(heights, res, 14, 18, 14, 18)
 	_check(variance_after < variance_before * 0.4,