diff --git a/modules/completion/init.zsh b/modules/completion/init.zsh
index 9ba9563..12cb333 100644
--- a/modules/completion/init.zsh
+++ b/modules/completion/init.zsh
@@ -84,7 +84,7 @@ if zstyle -t ':prezto:module:completion:*' case-sensitive; then
   zstyle ':completion:*' matcher-list 'r:|[._-]=* r:|=*' 'l:|=* r:|=*'
   setopt CASE_GLOB
 else
-  zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'r:|[._-]=* r:|=*' 'l:|=* r:|=*'
+  zstyle ':completion:*' matcher-list 'm:{[:lower:]}={[:upper:]}' 'm:{[:upper:]}={[:lower:]}'  'r:|[._-]=* r:|=*' 'l:|=* r:|=*'
   unsetopt CASE_GLOB
 fi