diff --git a/benchexec/baseexecutor.py b/benchexec/baseexecutor.py
index d62ff24c0..4c0a4a8ca 100644
--- a/benchexec/baseexecutor.py
+++ b/benchexec/baseexecutor.py
@@ -124,6 +124,7 @@ def pre_subprocess():
 
         def wait_and_get_result():
             exitcode, ru_child = self._wait_for_process(p.pid, args[0])
+            p.poll()
 
             parent_cleanup = parent_cleanup_fn(
                 parent_setup, util.ProcessExitCode.from_raw(exitcode), "", cgroups
diff --git a/pyproject.toml b/pyproject.toml
index e1ff62eaa..cede28c4c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -74,9 +74,6 @@ ignore = [
 [tool.pytest.ini_options]
 filterwarnings = [
     "error",
-    # TODO cf. https://github.com/sosy-lab/benchexec/issues/1073
-    # To make warning visible change "ignore" to "default".
-    "ignore:subprocess .* is still running:ResourceWarning",
 ]
 python_files = ["test_*.py", "test_integration/__init__.py", "test.py"]
 norecursedirs = ["contrib/p4/docker_files", "build", "benchexec/tablegenerator/react-table"]