diff --git a/pid/buildjson.cpp b/pid/buildjson.cpp
index c37a5f6..1122f09 100644
--- a/pid/buildjson.cpp
+++ b/pid/buildjson.cpp
@@ -187,6 +187,12 @@
             auto name = pid["name"];
             auto item = pid.get<conf::ControllerInfo>();
 
+            if (thisZone.find(name) != thisZone.end())
+            {
+                std::cerr << "Warning: zone " << id
+                          << " have the same pid name " << name << std::endl;
+            }
+
             thisZone[name] = item;
         }