diff --git a/var/spack/repos/builtin/packages/clingo-bootstrap/package.py b/var/spack/repos/builtin/packages/clingo-bootstrap/package.py
index 65535f330a..77027c4ba5 100644
--- a/var/spack/repos/builtin/packages/clingo-bootstrap/package.py
+++ b/var/spack/repos/builtin/packages/clingo-bootstrap/package.py
@@ -122,8 +122,9 @@ def pgo_train(self):
 
         # Run spack solve --fresh hdf5 with instrumented clingo.
         python_runtime_env = EnvironmentModifications()
-        for s in self.spec.traverse(deptype=("run", "link"), order="post"):
-            python_runtime_env.extend(spack.user_environment.environment_modifications_for_spec(s))
+        python_runtime_env.extend(
+            spack.user_environment.environment_modifications_for_specs(self.spec)
+        )
         python_runtime_env.unset("SPACK_ENV")
         python_runtime_env.unset("SPACK_PYTHON")
         self.spec["python"].command(