diff --git a/lib/completion.zsh b/lib/completion.zsh
index f5b292471..55e3dbcf1 100644
--- a/lib/completion.zsh
+++ b/lib/completion.zsh
@@ -12,7 +12,7 @@ zmodload -i zsh/complist
 
 ## case-insensitive (all),partial-word and then substring completion
 if [ "x$CASE_SENSITIVE" = "xtrue" ]; then
-  zstyle ':completion:*' matcher-list 'r:|[._-]=* r:|=*' 'l:|=* r:|=*'
+  zstyle ':completion:*' matcher-list '' 'r:|[._-]=* r:|=*' 'l:|=* r:|=*'
   unset CASE_SENSITIVE
 else
   if [ "x$HYPHEN_INSENSITIVE" = "xtrue" ]; then