diff --git a/sbb_binarize/ocrd-tool.json b/sbb_binarize/ocrd-tool.json
index 5bdf10f..8a1b1b9 100644
--- a/sbb_binarize/ocrd-tool.json
+++ b/sbb_binarize/ocrd-tool.json
@@ -12,7 +12,7 @@
       "parameters": {
         "operation_level": {
           "type": "string",
-          "enum": ["page", "region", "line"],
+          "enum": ["page", "region"],
           "default": "page",
           "description": "PAGE XML hierarchy level to operate on"
         },