diff --git a/gajim/common/config.py b/gajim/common/config.py
index b9f342d3df06d9f8278da4fd312067ab3bf4744d..0c0dafcc1b56bc282428f08ed0c5fbb65b8cae32 100644
--- a/gajim/common/config.py
+++ b/gajim/common/config.py
@@ -55,7 +55,6 @@ class Option(IntEnum):
 opt_bool = ['boolean', 0]
 opt_color = ['color', r'(#[0-9a-fA-F]{6})|rgb\(\d+,\d+,\d+\)|rgba\(\d+,\d+,\d+,[01]\.?\d*\)']
 opt_one_window_types = ['never', 'always', 'always_with_roster', 'peracct', 'pertype']
-opt_treat_incoming_messages = ['', 'chat', 'normal']
 
 
 class Config: