diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index c8c114a8b1f..abe17a8f2bc 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -695,7 +695,7 @@ def from_node_dict(node):
         spec = Spec(name)
         spec.versions = VersionList.from_dict(node)
         # TODO: Need to fix the architecture.Target.from_dict
-        spec.architecture = spack.architecture.from_dict(node['architecture'])
+        spec.architecture = spack.architecture.arch_from_dict(node['architecture'])
 
         if node['compiler'] is None:
             spec.compiler = None