diff --git a/scripts/pylib/twister/twisterlib/reports.py b/scripts/pylib/twister/twisterlib/reports.py
index 43fc2311f241b..0bf3846503778 100644
--- a/scripts/pylib/twister/twisterlib/reports.py
+++ b/scripts/pylib/twister/twisterlib/reports.py
@@ -12,6 +12,7 @@
 from datetime import datetime
 from enum import Enum
 from pathlib import Path
+from platform import system as platform_system
 
 from colorama import Fore
 from twisterlib.statuses import TwisterStatus
@@ -302,7 +303,7 @@ def json_report(self, filename, version="NA", platform=None, filters=None):
             report_options = self.env.non_default_options()
 
         report = {}
-        report["environment"] = {"os": os.name,
+        report["environment"] = {"os": platform_system(),
                                  "zephyr_version": version,
                                  "toolchain": self.env.toolchain,
                                  "commit_date": self.env.commit_date,