diff --git a/lib/Simba/Build.pm b/lib/Simba/Build.pm
index 25c4179..43100d1 100644
--- a/lib/Simba/Build.pm
+++ b/lib/Simba/Build.pm
@@ -26,7 +26,7 @@ sub ACTION_install {
 	close $in or die "cannot close $script: $!";
 	close $out or die "cannot close $script.$$: $!";
 	rename "$script.$$", $script or die "cannot rename $script.$$ to $script: $!";
-	chmod(555, $script);
+	chmod(0555, $script);
     }
     $self->SUPER::ACTION_install;
 }