diff --git a/.config/zsh/themes/prompt.zsh b/.config/zsh/themes/prompt.zsh
index d2724ea..12d573f 100644
--- a/.config/zsh/themes/prompt.zsh
+++ b/.config/zsh/themes/prompt.zsh
@@ -13,7 +13,7 @@ zsh_theme_colours[minor]="60"      # dark violet
 zsh_theme_colours[inactive]="236"  # grey
 
 [[ -n "${SSH_CONNECTION}" ]] && zsh_theme_colours[prompt]="yellow"
-[[ $(id -u) -eq 0 ]] && zsh_theme_colours[prompt]="red"
+[[ ${EUID} -eq 0 ]] && zsh_theme_colours[prompt]="red"
 
 # Show username if it is not the default user
 local showuser=""