diff --git a/pid/zone.hpp b/pid/zone.hpp
index a458011..78ebf0f 100644
--- a/pid/zone.hpp
+++ b/pid/zone.hpp
@@ -54,7 +54,7 @@
     {
         if (tuningLoggingEnabled && !tuningLoggingPath.empty())
         {
-            _log.open(tuningLoggingPath);
+            _log.open(tuningLoggingPath + std::to_string(zone));
         }
     }