diff --git a/src/trace.cpp b/src/trace.cpp
index 653e50e..25912e3 100644
--- a/src/trace.cpp
+++ b/src/trace.cpp
@@ -13,7 +13,7 @@ struct TraceLine
   TraceLine(uint8_t severity, const char *str, uint16_t len)
   {
     strncpy(_text, str, sizeof(_text));
-    _text[MAX_LINE_LEN + 1] = 0;
+    _text[MAX_LINE_LEN] = 0;
     _time = millis();
     _severity = severity;
   }