diff --git a/inlong-agent/agent-plugins/src/main/java/org/apache/inlong/agent/plugin/sources/SQLSource.java b/inlong-agent/agent-plugins/src/main/java/org/apache/inlong/agent/plugin/sources/SQLSource.java
index 2cf3c23dd9..02e229895b 100755
--- a/inlong-agent/agent-plugins/src/main/java/org/apache/inlong/agent/plugin/sources/SQLSource.java
+++ b/inlong-agent/agent-plugins/src/main/java/org/apache/inlong/agent/plugin/sources/SQLSource.java
@@ -69,7 +69,7 @@ public class SQLSource extends AbstractSource {
     @Data
     @AllArgsConstructor
     @NoArgsConstructor
-    protected class FileOffset {
+    protected static class FileOffset {
 
         private Long lineOffset;
         private Long byteOffset;