diff --git a/scripts/pylib/twister/twisterlib/reports.py b/scripts/pylib/twister/twisterlib/reports.py
index d5677445acb..1f2911aa3b0 100644
--- a/scripts/pylib/twister/twisterlib/reports.py
+++ b/scripts/pylib/twister/twisterlib/reports.py
@@ -398,7 +398,7 @@ class Reporting:
                 suite["reason"] = instance.reason
             else:
                 suite["status"] = TwisterStatus.NONE
-                suite["reason"] = 'Unknown Instance status.'
+                suite["reason"] = 'Unknown Instance status'
 
             if instance.status != TwisterStatus.NONE:
                 suite["execution_time"] =  f"{float(handler_time):.2f}"