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-rw-r--r--lib/spack/spack/build_environment.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/build_environment.py b/lib/spack/spack/build_environment.py
index af6d0f4e76..3737caf35e 100644
--- a/lib/spack/spack/build_environment.py
+++ b/lib/spack/spack/build_environment.py
@@ -1204,7 +1204,7 @@ def _setup_pkg_and_run(
# objects can't be sent to the parent.
exc_type = type(e)
tb = e.__traceback__
- tb_string = traceback.format_exception(exc_type, e, tb)
+ tb_string = "".join(traceback.format_exception(exc_type, e, tb))
# build up some context from the offending package so we can
# show that, too.