diff --git a/defaults.lua b/defaults.lua
index 49efe6050..865788d5a 100644
--- a/defaults.lua
+++ b/defaults.lua
@@ -95,7 +95,6 @@ DKOPTREADER_CONFIG_AUTO_STRAIGHTEN = 0    -- range from 0 to 10
 DKOPTREADER_CONFIG_JUSTIFICATION = 3    -- -1 = auto, 0 = left, 1 = center, 2 = right, 3 = full
 DKOPTREADER_CONFIG_MAX_COLUMNS = 2        -- range from 1 to 4
 DKOPTREADER_CONFIG_CONTRAST = 1.0        -- range from 0.2 to 2.0
-DKOPTREADER_CONFIG_INVERSE_READING_ORDER = 0 -- 1 = enable, 0 = disable
 
 -- word spacing for reflow
 DKOPTREADER_CONFIG_WORD_SPACINGS = {0.05, -0.2, 0.375}    -- range from (+/-)0.05 to (+/-)0.5