diff --git a/src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFSheet.java b/src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFSheet.java
index 1ca6a5f14..a6f31a555 100644
--- a/src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFSheet.java
+++ b/src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFSheet.java
@@ -58,7 +58,7 @@ import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorksheet;
 /**
  * Streaming version of XSSFSheet implementing the "BigGridDemo" strategy.
 */
-public class SXSSFSheet implements Sheet, Cloneable
+public class SXSSFSheet implements Sheet
 {
     /*package*/ final XSSFSheet _sh;
     private final SXSSFWorkbook _workbook;
diff --git a/src/scratchpad/src/org/apache/poi/hwpf/model/FileInformationBlock.java b/src/scratchpad/src/org/apache/poi/hwpf/model/FileInformationBlock.java
index 8e66f187e..0c14ca05d 100644
--- a/src/scratchpad/src/org/apache/poi/hwpf/model/FileInformationBlock.java
+++ b/src/scratchpad/src/org/apache/poi/hwpf/model/FileInformationBlock.java
@@ -42,7 +42,7 @@ import org.apache.poi.util.POILogger;
  * </ul>
  */
 @Internal
-public final class FileInformationBlock implements Cloneable
+public final class FileInformationBlock
 {
     public static final POILogger logger = POILogFactory
             .getLogger( FileInformationBlock.class );