diff --git a/jsowell-netty/src/main/java/com/jsowell/netty/handler/UploadRealTimeMonitorHandler.java b/jsowell-netty/src/main/java/com/jsowell/netty/handler/UploadRealTimeMonitorHandler.java
index fd48e52d4..1067d7ef0 100644
--- a/jsowell-netty/src/main/java/com/jsowell/netty/handler/UploadRealTimeMonitorHandler.java
+++ b/jsowell-netty/src/main/java/com/jsowell/netty/handler/UploadRealTimeMonitorHandler.java
@@ -227,7 +227,7 @@ public class UploadRealTimeMonitorHandler extends AbstractHandler {
 			int faultCode = 0;
 			for (int i = 0; i < binStr.length(); i++) {
 				if (binStr.charAt(i) == '1') {
-					faultCode = 16 - i;
+					faultCode = 15 - i;
 					break;
 				}
 			}