diff --git a/stack.yaml b/stack.yaml
index 97780d6c7d..5fe475ec21 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,6 +1,6 @@
 flags:
   git-annex:
-    asciiprogress: false
+    concurrentoutput: true
     tahoe: true
     tdfa: true
     inotify: true