diff --git a/src/qtoolkit/io/pbs.py b/src/qtoolkit/io/pbs.py
index 98acfc5..eec2ea0 100644
--- a/src/qtoolkit/io/pbs.py
+++ b/src/qtoolkit/io/pbs.py
@@ -88,21 +88,18 @@ class PBSIO(PBSIOBase):
 
     SUBMIT_CMD: str | None = "qsub"
     CANCEL_CMD: str | None = "qdel"
-
-    def __init__(self):
-        super().__init__()
-        self.system_name = "PBS"
-        self.default_unit = "mb"
-        self.power_labels = {"kb": 0, "mb": 1, "gb": 2, "tb": 3}
-        self._qresources_mapping = {
-            "queue_name": "queue",
-            "job_name": "job_name",
-            "account": "account",
-            "priority": "priority",
-            "output_filepath": "qout_path",
-            "error_filepath": "qerr_path",
-            "project": "group_list",
-        }
+    system_name: str = "PBS"
+    default_unit: str = "mb"
+    power_labels: dict = {"kb": 0, "mb": 1, "gb": 2, "tb": 3}
+    _qresources_mapping: dict = {
+        "queue_name": "queue",
+        "job_name": "job_name",
+        "account": "account",
+        "priority": "priority",
+        "output_filepath": "qout_path",
+        "error_filepath": "qerr_path",
+        "project": "group_list",
+    }
 
     def extract_job_id(self, stdout):
         return stdout.strip()
diff --git a/src/qtoolkit/io/pbs_base.py b/src/qtoolkit/io/pbs_base.py
index 86a7e2b..d414dfa 100644
--- a/src/qtoolkit/io/pbs_base.py
+++ b/src/qtoolkit/io/pbs_base.py
@@ -24,12 +24,10 @@ class PBSIOBase(BaseSchedulerIO, ABC):
 
     SUBMIT_CMD: str | None = "qsub"
     CANCEL_CMD: str | None = "qdel"
-
-    def __init__(self):
-        self._qresources_mapping = None
-        self.system_name = None
-        self.default_unit = None
-        self.power_labels = None
+    _qresources_mapping: dict
+    system_name: str
+    default_unit: str
+    power_labels: dict
 
     def parse_submit_output(self, exit_code, stdout, stderr) -> SubmissionResult:
         if isinstance(stdout, bytes):
diff --git a/src/qtoolkit/io/sge.py b/src/qtoolkit/io/sge.py
index ea0dd89..b9730be 100644
--- a/src/qtoolkit/io/sge.py
+++ b/src/qtoolkit/io/sge.py
@@ -125,21 +125,21 @@ class SGEIO(PBSIOBase):
 
     SUBMIT_CMD: str | None = "qsub"
     CANCEL_CMD: str | None = "qdel"
+    system_name: str = "SGE"
+    default_unit: str = "M"
+    power_labels: dict = {"k": 0, "m": 1, "g": 2, "t": 3}
+    _qresources_mapping: dict = {
+        "queue_name": "queue",
+        "job_name": "job_name",
+        "priority": "priority",
+        "output_filepath": "qout_path",
+        "error_filepath": "qerr_path",
+        "project": "group_list",
+    }
 
     def __init__(self, get_job_executable: str = "qstat"):
         super().__init__()
         self.get_job_executable = get_job_executable
-        self.system_name = "SGE"
-        self.default_unit = "M"
-        self.power_labels = {"k": 0, "m": 1, "g": 2, "t": 3}
-        self._qresources_mapping = {
-            "queue_name": "queue",
-            "job_name": "job_name",
-            "priority": "priority",
-            "output_filepath": "qout_path",
-            "error_filepath": "qerr_path",
-            "project": "group_list",
-        }
 
     def extract_job_id(self, stdout):
         match = re.search(r'Your job (\d+) \(".*?"\) has been submitted', stdout)