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-rw-r--r--lib/spack/docs/conf.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/docs/conf.py b/lib/spack/docs/conf.py
index a702e70e51..b23e365960 100644
--- a/lib/spack/docs/conf.py
+++ b/lib/spack/docs/conf.py
@@ -52,7 +52,7 @@ sys.path.append(os.path.abspath('../spack'))
# Add the Spack bin directory to the path so that we can use its output in docs.
spack_root = '../../..'
os.environ['SPACK_ROOT'] = spack_root
-os.environ['PATH'] += os.pathsep + '$SPACK_ROOT/bin'
+os.environ['PATH'] += '%s%s/bin' % (os.pathsep, spack_root)
# Get the spack version for use in the docs
spack_version = subprocess.Popen(