--- a/check_raid/check_raid
+++ b/check_raid/check_raid
@@ -3661,7 +3661,7 @@ $fatpacked{"App/Monitoring/Plugin/CheckR
   		} elsif (@fd > 0) {
   			# FIXME: this is same as above?
   			$this->warning;
-  			$s .= "hot-spare failure:". join(",", @{$md{failed_disks}}) .":$md{status}";
+			$s .= "hot-spare failure:". join(",", @fd) .":$md{status}";
   
   		} else {
   			$s .= "$md{status}";
