diff --git a/netoik-home.spec b/netoik-home.spec
index 9877c70..871e6ad 100644
--- a/netoik-home.spec
+++ b/netoik-home.spec
@@ -24,7 +24,7 @@ Netoik home page
 ln --symbolic %{_var}/netoik-api/captcha %{_var}/www/%{name}/assets/img/captcha
 
 %preun
-$1 -eq 0 && rm %{_var}/www/%{name}/assets/img/captcha
+[ $1 -eq 0 ] && rm %{_var}/www/%{name}/assets/img/captcha
 
 %files
 %define bootstrap_version %(make bootstrap_version)