diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/memory/ThreadSafeMemoryReservationManager.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/memory/ThreadSafeMemoryReservationManager.java
index 190c4fedd5c6..d167eae354ff 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/memory/ThreadSafeMemoryReservationManager.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/memory/ThreadSafeMemoryReservationManager.java
@@ -52,12 +52,12 @@ public synchronized void releaseAllReservedMemory() {
   }
 
   @Override
-  public Pair<Long, Long> releaseMemoryVirtually(final long size) {
+  public synchronized Pair<Long, Long> releaseMemoryVirtually(final long size) {
     return super.releaseMemoryVirtually(size);
   }
 
   @Override
-  public void reserveMemoryVirtually(
+  public synchronized void reserveMemoryVirtually(
       final long bytesToBeReserved, final long bytesAlreadyReserved) {
     super.reserveMemoryVirtually(bytesToBeReserved, bytesAlreadyReserved);
   }