diff --git a/extras/check_for_update.zsh b/extras/check_for_update.zsh
index e38984f..b02d63b 100755
--- a/extras/check_for_update.zsh
+++ b/extras/check_for_update.zsh
@@ -14,7 +14,7 @@ fi
 # Cancel update if:
 # - the automatic update is disabled.
 # - git is unavailable on the system.
-if [[ "$DISABLE_DOTFILES_AUTOUPDATE" = true ]] || ! command -v git &>/dev/null; then
+if [[ -n $DISABLE_DOTFILES_AUTOUPDATE ]] || ! command -v git &>/dev/null; then
   return
 fi