diff --git a/paimon-core/src/main/java/org/apache/paimon/operation/OrphanFilesClean.java b/paimon-core/src/main/java/org/apache/paimon/operation/OrphanFilesClean.java
index f6ffd102c0ae..e78174db7ac9 100644
--- a/paimon-core/src/main/java/org/apache/paimon/operation/OrphanFilesClean.java
+++ b/paimon-core/src/main/java/org/apache/paimon/operation/OrphanFilesClean.java
@@ -476,7 +476,7 @@ private List<Path> filterAndCleanDataDirs(
                     .forEach(
                             p -> {
                                 deleteFileOrDirQuietly(p);
-                                synchronized (this) {
+                                synchronized (deleteFiles) {
                                     deleteFiles.add(p);
                                     deletedFilesNum++;
                                 }