diff --git a/trh_nagioslib.py b/trh_nagioslib.py
index d9f4d4083023678c1fab05075b632ce45870acd3..8eb5661ae84ca9dcae04a2e8db7879ce11f6a77f 100644
--- a/trh_nagioslib.py
+++ b/trh_nagioslib.py
@@ -247,7 +247,7 @@ def nagios_report(statuses):
             message += st + ": " + msg + "\n"
 
     if max_level < 0:
-        max_level = NAGIOSCODES.index('UNKNOWN') + 1
+        max_level = NAGIOSCODES.index('UNKNOWN')
         message = "UNKNOWN: No status report\n"
 
     return max_level, message