diff --git a/lib/roby/task_structure/dependency.rb b/lib/roby/task_structure/dependency.rb
index 4364c6e16..db15e15c2 100644
--- a/lib/roby/task_structure/dependency.rb
+++ b/lib/roby/task_structure/dependency.rb
@@ -905,7 +905,7 @@ def pretty_print(pp) # :nodoc:
             if mode == :failed_event
                 pp.text "triggered the failure predicate '#{relation[:failure]}': "
             elsif mode == :unreachable_success
-                pp.text "cannot reach the success condition '#{relation[:success]}': "
+                pp.text "success condition can no longer be reached '#{relation[:success]}': "
             end
             explanation.pretty_print(pp)