diff --git a/python/plugins/processing/gui/ProcessingToolbox.py b/python/plugins/processing/gui/ProcessingToolbox.py
index e80a096c4b1..5024a3a4cbf 100644
--- a/python/plugins/processing/gui/ProcessingToolbox.py
+++ b/python/plugins/processing/gui/ProcessingToolbox.py
@@ -51,8 +51,6 @@ WIDGET, BASE = uic.loadUiType(
 
 class ProcessingToolbox(BASE, WIDGET):
 
-    USE_CATEGORIES = '/Processing/UseSimplifiedInterface'
-
     updateAlgList = True
 
     def __init__(self):