diff --git a/lib/completion.zsh b/lib/completion.zsh
index 2c5695487..63379b53f 100644
--- a/lib/completion.zsh
+++ b/lib/completion.zsh
@@ -18,9 +18,9 @@ if [[ "$CASE_SENSITIVE" = true ]]; then
   zstyle ':completion:*' matcher-list 'r:|=*' 'l:|=* r:|=*'
 else
   if [[ "$HYPHEN_INSENSITIVE" = true ]]; then
-    zstyle ':completion:*' matcher-list 'm:{a-zA-Z-_}={A-Za-z_-}' 'r:|=*' 'l:|=* r:|=*'
+    zstyle ':completion:*' matcher-list 'm:{[:lower:][:upper:]-_}={[:upper:][:lower:]_-}' 'r:|=*' 'l:|=* r:|=*'
   else
-    zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'r:|=*' 'l:|=* r:|=*'
+    zstyle ':completion:*' matcher-list 'm:{[:lower:][:upper:]}={[:upper:][:lower:]}' 'r:|=*' 'l:|=* r:|=*'
   fi
 fi
 unset CASE_SENSITIVE HYPHEN_INSENSITIVE