diff --git a/contrib/polybar.aur/polybar.install b/contrib/polybar.aur/polybar.install
index c46ee3c7..e34534e8 100644
--- a/contrib/polybar.aur/polybar.install
+++ b/contrib/polybar.aur/polybar.install
@@ -12,7 +12,7 @@ EOF
 }
 
 post_upgrade() {
-  (( ${2//./} <= 251 )) && cat << EOF
+  (( ${2//[^0-9]/} <= 2511 )) && cat << EOF
 
   The % suffix has been removed from percentage tokens.
   The suffix is instead added by the user, for example: