diff --git a/lib/spack/spack/solver/asp.py b/lib/spack/spack/solver/asp.py
index 7b13b4baa3..6ddca741ce 100644
--- a/lib/spack/spack/solver/asp.py
+++ b/lib/spack/spack/solver/asp.py
@@ -2730,9 +2730,8 @@ def reorder_flags(self):
 
                 spec.compiler_flags.update({flag_type: ordered_compiler_flags})
 
-    def deprecated(self, pkg, version):
-        msg = 'using "{0}@{1}" which is a deprecated version'
-        tty.warn(msg.format(pkg, version))
+    def deprecated(self, node: NodeArgument, version: str) -> None:
+        tty.warn(f'using "{node.pkg}@{version}" which is a deprecated version')
 
     @staticmethod
     def sort_fn(function_tuple):