diff --git a/system/.config/custom/env b/system/.config/custom/env
index 091c375..7da1e24 100644
--- a/system/.config/custom/env
+++ b/system/.config/custom/env
@@ -105,7 +105,7 @@ function prompt_width() {
     pwd="$(print -P %~)"
     file_count="$(file_count)"
     folder_size="$(folder_size)"
-    echo "$(($COLUMNS - 19 - ${#hostname} - ${#branch} - ${#pwd} - ${#file_count} - ${#folder_size}))"
+    echo "$((COLUMNS - 19 - ${#hostname} - ${#branch} - ${#pwd} - ${#file_count} - ${#folder_size}))"
 }
 
 function precmd() {