diff --git a/avocado/plugins/human.py b/avocado/plugins/human.py
index c35be6fb3e4656d8ad77fdc0ff6dc817631943cf..58aa2945fe66097f5bd48bca61a203da7e67a1fc 100644
--- a/avocado/plugins/human.py
+++ b/avocado/plugins/human.py
@@ -79,6 +79,9 @@ class Human(ResultEvents):
         out = (output.TERM_SUPPORT.MOVE_BACK + self.output_mapping[status] +
                status)
         if extra:
+            if len(extra) > 255:
+                extra = extra[:255] + '...'
+            extra = extra.replace('\n', '\\n')
             out += ": " + extra
         out += output.TERM_SUPPORT.ENDC
         return out