diff --git a/src/WebSocketClientServer.cpp b/src/WebSocketClientServer.cpp
index 8d09307..c07ca6f 100644
--- a/src/WebSocketClientServer.cpp
+++ b/src/WebSocketClientServer.cpp
@@ -219,7 +219,7 @@ namespace OpenWifi {
             Query = fmt::format(" operatorId='{}' and (right(serialNumber,{})='{}' or right(realMacAddress,{})='{}' ) ",
                                 operatorId, Prefix.size()-1, Prefix.substr(1), Prefix.size()-1, Prefix.substr(1));
         } else {
-            Query = fmt::format(" operatorId='{}' and (left(serialNumber,{})='{}'  or right(realMacAddress,{})='{}' ) ",
+            Query = fmt::format(" operatorId='{}' and (left(serialNumber,{})='{}'  or left(realMacAddress,{})='{}' ) ",
                                 operatorId, Prefix.size(), Prefix, Prefix.size(), Prefix);
         }