diff --git a/lib/spack/spack/install_test.py b/lib/spack/spack/install_test.py
index d0b3b5c4b11..98e9259944d 100644
--- a/lib/spack/spack/install_test.py
+++ b/lib/spack/spack/install_test.py
@@ -402,6 +402,7 @@ def stand_alone_tests(self, kwargs, timeout: Optional[int] = None) -> None:
         spack.build_environment.start_build_process(
             self.pkg, test_process, kwargs, timeout=timeout
         )
+        spack.build_environment.complete_build_process()
 
     def parts(self) -> int:
         """The total number of (checked) test parts."""
diff --git a/lib/spack/spack/installer.py b/lib/spack/spack/installer.py
index 14a45dda091..cdfd34fb33e 100644
--- a/lib/spack/spack/installer.py
+++ b/lib/spack/spack/installer.py
@@ -1144,7 +1144,6 @@ def priority(self):
 class BuildTask(Task):
     """Class for representing a build task for a package."""
 
-    process_handle: Optional[spack.build_environment.ProcessHandle] = None
     started: bool = False
 
     def start(self):