diff --git a/parquet-common/src/main/java/org/apache/parquet/bytes/BytesInput.java b/parquet-common/src/main/java/org/apache/parquet/bytes/BytesInput.java
index ca139d9243..89c1bca4d8 100644
--- a/parquet-common/src/main/java/org/apache/parquet/bytes/BytesInput.java
+++ b/parquet-common/src/main/java/org/apache/parquet/bytes/BytesInput.java
@@ -690,18 +690,9 @@ public ByteBuffer toByteBuffer() throws IOException {
       return java.nio.ByteBuffer.wrap(in, offset, length);
     }
 
-    /**
-     * Zero-copy override: returns the backing array directly when fully used,
-     * skipping the base-class BAOS allocation + copy on every decompressor call.
-     * Returning the mutable array is safe — the base class already exposes a
-     * mutable {@code BAOS.getBuf()}.
-     */
     @SuppressWarnings("deprecation")
     @Override
     public byte[] toByteArray() {
-      if (offset == 0 && length == in.length) {
-        return in;
-      }
       return Arrays.copyOfRange(in, offset, offset + length);
     }
 
diff --git a/parquet-common/src/test/java/org/apache/parquet/bytes/TestBytesInput.java b/parquet-common/src/test/java/org/apache/parquet/bytes/TestBytesInput.java
index a80c874fa2..18e9b02efb 100644
--- a/parquet-common/src/test/java/org/apache/parquet/bytes/TestBytesInput.java
+++ b/parquet-common/src/test/java/org/apache/parquet/bytes/TestBytesInput.java
@@ -123,16 +123,14 @@ public void testFromByteArray(ByteBufferAllocator innerAllocator) throws IOExcep
 
   @ParameterizedTest(name = "{0}")
   @MethodSource("parameters")
-  public void testFromByteArrayToByteArrayZeroCopy(ByteBufferAllocator innerAllocator) throws IOException {
+  public void testCopyDoesNotAliasSourceBytes(ByteBufferAllocator innerAllocator) throws IOException {
     initAllocator(innerAllocator);
-    // Full array (offset=0, length=array.length): toByteArray() returns the backing array directly
-    byte[] data = new byte[1000];
-    RANDOM.nextBytes(data);
-    BytesInput bi = BytesInput.from(data, 0, data.length);
-    byte[] result = bi.toByteArray();
-    assertThat(result)
-        .as("toByteArray() should return the backing array when offset=0 and length=full")
-        .isSameAs(data);
+    byte[] source = {'a'};
+    BytesInput copied = BytesInput.copy(BytesInput.from(source));
+
+    source[0] = 'b';
+
+    assertThat(copied.toByteArray()).isEqualTo(new byte[] {'a'});
   }
 
   @ParameterizedTest(name = "{0}")