diff --git a/vector/src/main/java/org/apache/arrow/vector/complex/StructVector.java b/vector/src/main/java/org/apache/arrow/vector/complex/StructVector.java
index 5e5bb7fc21..21ea9c6f05 100644
--- a/vector/src/main/java/org/apache/arrow/vector/complex/StructVector.java
+++ b/vector/src/main/java/org/apache/arrow/vector/complex/StructVector.java
@@ -529,7 +529,7 @@ public void reAlloc() {
     super.reAlloc();
   }
 
-  private void reallocValidityBuffer() {
+  protected void reallocValidityBuffer() {
     final int currentBufferCapacity = checkedCastToInt(validityBuffer.capacity());
     long newAllocationSize = getNewAllocationSize(currentBufferCapacity);