diff --git a/src/trick17/__init__.py b/src/trick17/__init__.py
index 500ae0a..b6170f4 100644
--- a/src/trick17/__init__.py
+++ b/src/trick17/__init__.py
@@ -1,3 +1,10 @@
 # SPDX-FileCopyrightText: 2023-present Stefano Miccoli <stefano.miccoli@polimi.it>
 #
 # SPDX-License-Identifier: MIT
+
+# systemd notable paths
+SD_BOOTED_PATH = "/run/systemd/system"
+SD_JOURNAL_SOCKET_PATH = "/run/systemd/journal/socket"
+
+# environmet variables possibly set by systemd
+SD_JOURNAL_STREAM_ENV = "JOURNAL_STREAM"
diff --git a/src/trick17/journal.py b/src/trick17/journal.py
index a8d8a4f..cc692d2 100644
--- a/src/trick17/journal.py
+++ b/src/trick17/journal.py
@@ -13,16 +13,21 @@
 import sys
 import syslog
 
+import trick17
+
 
 def stderr_is_journal() -> bool:
     stat = os.fstat(sys.stderr.fileno())
-    return os.environ.get("JOURNAL_STREAM", "") == f"{stat.st_dev}:{stat.st_ino}"
+    return (
+        os.environ.get(trick17.SD_JOURNAL_STREAM_ENV, "")
+        == f"{stat.st_dev}:{stat.st_ino}"
+    )
 
 
 class JournalHandler(logging.Handler):
     """Simple logger for the Systemd Native Journal Protocol"""
 
-    SADDR: str = "/run/systemd/journal/socket"
+    SADDR: str = trick17.SD_JOURNAL_SOCKET_PATH
 
     @staticmethod
     def _serialize(key: bytes, val: bytes) -> bytes: