diff --git a/lib/spack/spack/main.py b/lib/spack/spack/main.py
index 73db304d9e0..adc7245333b 100644
--- a/lib/spack/spack/main.py
+++ b/lib/spack/spack/main.py
@@ -591,11 +591,6 @@ def shell_set(var, value):
     other_spack_instances = spack.config.get(
         'upstreams') or {}
 
-    if spack.config.get('config:shared'):
-        path = spack.util.path.canonicalize_path("$spack/opt/spack")
-        other_spack_instances.update({'spack-root':
-                                     {'install_tree': path}})
-
     for install_properties in other_spack_instances.values():
         upstream_module_roots = install_properties.get('modules', {})
         for module_type, root in upstream_module_roots.items():