--- a/mercurial/cmdutil.py	Thu Aug 03 14:32:50 2017 +0200
+++ b/mercurial/cmdutil.py	Thu Aug 03 15:30:41 2017 +0200
@@ -1573,7 +1573,7 @@
     if ctx.isunstable():
         labels.append('changeset.unstable')
         for instability in ctx.instabilities():
-            labels.append('trouble.%s' % instability)
+            labels.append('instability.%s' % instability)
     return ' '.join(labels)
 
 class changeset_printer(object):