diff --git a/Makefile b/Makefile
index dfe7137c4a..97c6803dc0 100644
--- a/Makefile
+++ b/Makefile
@@ -113,7 +113,7 @@ define PROJECT_ENV
 	    {queue_explicit_gc_run_operation_threshold, 1000},
 	    {lazy_queue_explicit_gc_run_operation_threshold, 1000},
 	    {background_gc_enabled, false},
-	    {background_gc_target_interval, 60000}
+	    {background_gc_target_interval, 60000},
 	    %% rabbitmq-server-589
 	    {proxy_protocol, false}
 	  ]