diff --git a/paimon-format/src/main/java/org/apache/paimon/format/orc/writer/OrcBulkWriter.java b/paimon-format/src/main/java/org/apache/paimon/format/orc/writer/OrcBulkWriter.java
index 34278638fd40..478751fa1339 100644
--- a/paimon-format/src/main/java/org/apache/paimon/format/orc/writer/OrcBulkWriter.java
+++ b/paimon-format/src/main/java/org/apache/paimon/format/orc/writer/OrcBulkWriter.java
@@ -25,12 +25,8 @@
 
 import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
 import org.apache.orc.Writer;
-import org.apache.orc.impl.writer.TreeWriter;
 
 import java.io.IOException;
-import java.lang.reflect.Field;
-import java.security.AccessController;
-import java.security.PrivilegedAction;
 
 import static org.apache.paimon.utils.Preconditions.checkNotNull;
 
@@ -41,7 +37,6 @@ public class OrcBulkWriter implements FormatWriter {
     private final Vectorizer<InternalRow> vectorizer;
     private final VectorizedRowBatch rowBatch;
     private final PositionOutputStream underlyingStream;
-    private final TreeWriter treeWriter;
 
     public OrcBulkWriter(
             Vectorizer<InternalRow> vectorizer,
@@ -56,8 +51,6 @@ public OrcBulkWriter(
         // metadata on the fly through the Vectorizer#vectorize(...) method.
         this.vectorizer.setWriter(this.writer);
         this.underlyingStream = underlyingStream;
-        // TODO: Turn to access these hidden field directly after upgrade to ORC 1.7.4
-        this.treeWriter = getHiddenFieldInORC("treeWriter");
     }
 
     @Override
@@ -89,30 +82,13 @@ public boolean reachTargetSize(boolean suggestedCheck, long targetSize) throws I
     }
 
     private long length() throws IOException {
-        long estimateMemory = treeWriter.estimateMemory();
+        long estimateMemory = writer.estimateMemory();
         long fileLength = underlyingStream.getPos();
 
         // This value is estimated, not actual.
         return (long) Math.ceil(fileLength + estimateMemory * 0.2);
     }
 
-    @SuppressWarnings("unchecked")
-    private <T> T getHiddenFieldInORC(String fieldName) {
-        try {
-            Field treeWriterField = writer.getClass().getDeclaredField(fieldName);
-            AccessController.doPrivileged(
-                    (PrivilegedAction<Void>)
-                            () -> {
-                                treeWriterField.setAccessible(true);
-                                return null;
-                            });
-            return (T) treeWriterField.get(writer);
-        } catch (Exception e) {
-            throw new RuntimeException(
-                    "Cannot get " + fieldName + " from " + writer.getClass().getName(), e);
-        }
-    }
-
     @VisibleForTesting
     VectorizedRowBatch getRowBatch() {
         return rowBatch;