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-rw-r--r--lib/spack/spack/concretize.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/spack/spack/concretize.py b/lib/spack/spack/concretize.py
index 5d9715feed..58811c3419 100644
--- a/lib/spack/spack/concretize.py
+++ b/lib/spack/spack/concretize.py
@@ -84,7 +84,8 @@ class DefaultConcretizer(object):
raise NoBuildError(spec)
def cmp_externals(a, b):
- if a.name != b.name:
+ if a.name != b.name and (not a.external or a.external_module and
+ not b.external and b.external_module):
# We're choosing between different providers, so
# maintain order from provider sort
return candidates.index(a) - candidates.index(b)