diff --git a/src/somd2/runner/_dynamics.py b/src/somd2/runner/_dynamics.py
index 213d43e..2ab957b 100644
--- a/src/somd2/runner/_dynamics.py
+++ b/src/somd2/runner/_dynamics.py
@@ -20,7 +20,7 @@
 #####################################################################
 
 __all__ = ["Dynamics"]
-import os as _os
+import platform as _platform
 from pathlib import Path as _Path
 
 from ..config import Config as _Config
@@ -29,7 +29,7 @@
 
 from somd2 import _logger
 
-if _os.platform == "win32":
+if _platform == "win32":
     lam_sym = "lambda"
 else:
     lam_sym = "λ"
diff --git a/src/somd2/runner/_runner.py b/src/somd2/runner/_runner.py
index 216be04..7d7e134 100644
--- a/src/somd2/runner/_runner.py
+++ b/src/somd2/runner/_runner.py
@@ -21,7 +21,7 @@
 
 __all__ = ["Runner"]
 
-import os as _os
+import platform as _platform
 from sire import stream as _stream
 from sire.system import System as _System
 
@@ -31,7 +31,7 @@
 
 from somd2 import _logger
 
-if _os.platform == "win32":
+if _platform == "win32":
     lam_sym = "lambda"
 else:
     lam_sym = "λ"