diff --git a/modules/history-substring-search/init.zsh b/modules/history-substring-search/init.zsh
index b2a2b71..fc02836 100644
--- a/modules/history-substring-search/init.zsh
+++ b/modules/history-substring-search/init.zsh
@@ -5,11 +5,6 @@
 # source script
 source ${0:h}/external/zsh-history-substring-search.zsh || return 1
 
-# set options
-HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_FOUND='bg=magenta,fg=white,bold'
-HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_NOT_FOUND='bg=red,fg=white,bold'
-HISTORY_SUBSTRING_SEARCH_GLOBBING_FLAGS='i'
-
 # bind UP and DOWN keys
 bindkey "${terminfo[kcuu1]}" history-substring-search-up
 bindkey "${terminfo[kcud1]}" history-substring-search-down