diff --git a/config/game_options.txt b/config/game_options.txt
index 7a3b2d42059..82986412d43 100644
--- a/config/game_options.txt
+++ b/config/game_options.txt
@@ -90,7 +90,7 @@ PROBABILITY BLOB 2
 PROBABILITY MONKEY 0
 PROBABILITY METEOR 0
 PROBABILITY EXTENDED 0
-PROBABILITY SECRET_EXTENDED
+PROBABILITY SECRET_EXTENDED 0
 PROBABILITY DEVIL 0
 PROBABILITY DEVIL_AGENTS 0