diff --git a/python/test_trace_generator_manager.py b/python/test_trace_generator_manager.py
index dc9a3b2edffacc202562da2cd32ef6390211cfcc..8aa58b47398878c72f25261ce5a4571a8a971d77 100644
--- a/python/test_trace_generator_manager.py
+++ b/python/test_trace_generator_manager.py
@@ -169,7 +169,7 @@ class TestTraceGeneratorManager():
             for _stream_name, line in list(self._queue.queue):
                 if line[:14] == "*** error: at ":
                     # error
-                    raise RuntimeError("bad: %s"%line[:14])
+                    raise RuntimeError("bad: %s"%line)
 
             self._manage_bad_return_code()