diff --git a/plugins/CuraEngineBackend/Cura.proto b/plugins/CuraEngineBackend/Cura.proto
index d5d7c92d0b..96f1f64477 100644
--- a/plugins/CuraEngineBackend/Cura.proto
+++ b/plugins/CuraEngineBackend/Cura.proto
@@ -13,6 +13,7 @@ enum SlotID {
   SIMPLIFY_MODIFY = 100;
   POSTPROCESS_MODIFY = 101;
   INFILL_MODIFY = 102;
+  GCODE_PATHS_MODIFY = 103;
   INFILL_GENERATE = 200;
 }