diff --git a/lib/spack/spack/solver/asp.py b/lib/spack/spack/solver/asp.py
index 438e753ee9a..105efcd6cca 100644
--- a/lib/spack/spack/solver/asp.py
+++ b/lib/spack/spack/solver/asp.py
@@ -847,8 +847,6 @@ def on_model(model):
             error_handler = ErrorHandler(best_model)
             error_handler.raise_if_errors()
 
-            # build specs from spec attributes in the model
-            spec_attrs = [(name, tuple(rest)) for name, *rest in extract_args(best_model, "attr")]
             answers = builder.build_specs(spec_attrs)
 
             # add best spec to the results