diff --git a/src/psij/_plugins.py b/src/psij/_plugins.py
index 4b8b9121..07ec1041 100644
--- a/src/psij/_plugins.py
+++ b/src/psij/_plugins.py
@@ -53,7 +53,7 @@ def _register_plugin(desc: Descriptor, root_path: str, type: str,
         mod = importlib.util.module_from_spec(spec)
         spec.loader.exec_module(mod)  # type: ignore
         cls = getattr(mod, cls_name)
-        cls.__psij_file__ = mod_path  # type: ignore
+        cls.__psij_file__ = mod_path
     except Exception as ex:
         s = str(ex)
         logger.info(s)
diff --git a/src/psij/job_spec.py b/src/psij/job_spec.py
index e3585d0d..f4d383e2 100644
--- a/src/psij/job_spec.py
+++ b/src/psij/job_spec.py
@@ -137,7 +137,7 @@ def __init__(self, executable: Optional[str] = None, arguments: Optional[List[st
         # care of the conversion, but mypy gets confused
         self._directory = _to_path(directory)
         self.inherit_environment = inherit_environment
-        self.environment = _to_env_dict(environment)
+        self._environment = _to_env_dict(environment)
         self._stdin_path = _to_path(stdin_path)
         self._stdout_path = _to_path(stdout_path)
         self._stderr_path = _to_path(stderr_path)
diff --git a/tests/test_executor.py b/tests/test_executor.py
index ac6bef0e..83090ecc 100644
--- a/tests/test_executor.py
+++ b/tests/test_executor.py
@@ -142,7 +142,7 @@ def test_env_var(execparams: ExecutorTestParams) -> None:
                           arguments=['-c', 'env > /tmp/t; echo -n $TEST_VAR$TEST_INT'],
                           stdout_path=outp))
         assert job.spec is not None
-        job.spec.environment = {'TEST_INT': 1, 'TEST_VAR': '_y_'}  # type: ignore
+        job.spec.environment = {'TEST_INT': 1, 'TEST_VAR': '_y_'}
         ex = _get_executor_instance(execparams, job)
         ex.submit(job)
         status = job.wait(timeout=_get_timeout(execparams))
diff --git a/tests/test_job_spec.py b/tests/test_job_spec.py
index f02b6305..1c40618f 100644
--- a/tests/test_job_spec.py
+++ b/tests/test_job_spec.py
@@ -29,13 +29,15 @@ def test_environment_types() -> None:
     assert spec.environment is None
 
     spec = JobSpec(environment={'foo': 'bar'})
-    assert spec.environment['foo'] == 'bar'  # type: ignore
+    assert spec.environment is not None
+    assert spec.environment['foo'] == 'bar'
 
     spec = JobSpec()
     spec.environment = {'foo': 'bar'}
+    assert spec.environment is not None
     assert spec.environment['foo'] == 'bar'
 
-    spec.environment = {'foo': 'biz', 'bar': 42}  # type: ignore
+    spec.environment = {'foo': 'biz', 'bar': 42}
     assert spec.environment['foo'] == 'biz'
     assert spec.environment['bar'] == '42'