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-rw-r--r--lib/spack/spack/bootstrap.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/bootstrap.py b/lib/spack/spack/bootstrap.py
index cfcaac2a31..2e0f2614e7 100644
--- a/lib/spack/spack/bootstrap.py
+++ b/lib/spack/spack/bootstrap.py
@@ -658,7 +658,7 @@ def _add_externals_if_missing():
spack.repo.path.get_pkg_class("gawk"),
]
if is_windows:
- search_list.extend(spack.repo.path.get_pkg_class("winbison"))
+ search_list.append(spack.repo.path.get_pkg_class("winbison"))
detected_packages = spack.detection.by_executable(search_list)
spack.detection.update_configuration(detected_packages, scope="bootstrap")