diff --git a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/BaseFormat.java b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/BaseFormat.java
index 25cd36817..4757998a2 100644
--- a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/BaseFormat.java
+++ b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/BaseFormat.java
@@ -15,6 +15,7 @@
 import java.text.MessageFormat;
 import java.util.Map;
 
+import org.apache.commons.compress.archivers.ArchiveEntry;
 import org.apache.commons.compress.archivers.ArchiveOutputStream;
 import org.eclipse.jgit.archive.internal.ArchiveText;
 import org.eclipse.jgit.util.StringUtils;
@@ -42,7 +43,8 @@ public class BaseFormat {
 	 * @throws IOException
 	 *             if an IO error occurred
 	 */
-	protected ArchiveOutputStream applyFormatOptions(ArchiveOutputStream s,
+	protected ArchiveOutputStream<? extends ArchiveEntry> applyFormatOptions(
+			ArchiveOutputStream<? extends ArchiveEntry> s,
 			Map<String, Object> o) throws IOException {
 		for (Map.Entry<String, Object> p : o.entrySet()) {
 			try {
diff --git a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TarFormat.java b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TarFormat.java
index dfa60321b..3db112475 100644
--- a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TarFormat.java
+++ b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TarFormat.java
@@ -35,7 +35,7 @@
  * Unix TAR format (ustar + some PAX extensions).
  */
 public final class TarFormat extends BaseFormat implements
-		ArchiveCommand.Format<ArchiveOutputStream> {
+		ArchiveCommand.Format<ArchiveOutputStream<TarArchiveEntry>> {
 	private static final List<String> SUFFIXES = Collections
 			.unmodifiableList(Arrays.asList(".tar")); //$NON-NLS-1$
 
@@ -57,7 +57,7 @@ public ArchiveOutputStream createArchiveOutputStream(OutputStream s,
 	}
 
 	@Override
-	public void putEntry(ArchiveOutputStream out,
+	public void putEntry(ArchiveOutputStream<TarArchiveEntry> out,
 			ObjectId tree, String path, FileMode mode, ObjectLoader loader)
 			throws IOException {
 		if (mode == FileMode.SYMLINK) {
diff --git a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/Tbz2Format.java b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/Tbz2Format.java
index 26da43114..03a2305e2 100644
--- a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/Tbz2Format.java
+++ b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/Tbz2Format.java
@@ -17,6 +17,7 @@
 import java.util.Map;
 
 import org.apache.commons.compress.archivers.ArchiveOutputStream;
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;
 import org.eclipse.jgit.api.ArchiveCommand;
 import org.eclipse.jgit.lib.FileMode;
@@ -26,12 +27,12 @@
 /**
  * bzip2-compressed tarball (tar.bz2) format.
  */
-public final class Tbz2Format extends BaseFormat implements
-		ArchiveCommand.Format<ArchiveOutputStream> {
+public final class Tbz2Format extends BaseFormat
+		implements ArchiveCommand.Format<ArchiveOutputStream<TarArchiveEntry>> {
 	private static final List<String> SUFFIXES = Collections
 			.unmodifiableList(Arrays.asList(".tar.bz2", ".tbz", ".tbz2")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 
-	private final ArchiveCommand.Format<ArchiveOutputStream> tarFormat = new TarFormat();
+	private final ArchiveCommand.Format<ArchiveOutputStream<TarArchiveEntry>> tarFormat = new TarFormat();
 
 	@Override
 	public ArchiveOutputStream createArchiveOutputStream(OutputStream s)
@@ -54,7 +55,7 @@ public ArchiveOutputStream createArchiveOutputStream(OutputStream s,
 	}
 
 	@Override
-	public void putEntry(ArchiveOutputStream out,
+	public void putEntry(ArchiveOutputStream<TarArchiveEntry> out,
 			ObjectId tree, String path, FileMode mode, ObjectLoader loader)
 			throws IOException {
 		tarFormat.putEntry(out, tree, path, mode, loader);
diff --git a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TgzFormat.java b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TgzFormat.java
index d1ed035d0..6ce9c1e74 100644
--- a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TgzFormat.java
+++ b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TgzFormat.java
@@ -17,6 +17,7 @@
 import java.util.Map;
 
 import org.apache.commons.compress.archivers.ArchiveOutputStream;
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;
 import org.apache.commons.compress.compressors.gzip.GzipParameters;
 import org.eclipse.jgit.api.ArchiveCommand;
@@ -27,12 +28,12 @@
 /**
  * gzip-compressed tarball (tar.gz) format.
  */
-public final class TgzFormat extends BaseFormat implements
-		ArchiveCommand.Format<ArchiveOutputStream> {
+public final class TgzFormat extends BaseFormat
+		implements ArchiveCommand.Format<ArchiveOutputStream<TarArchiveEntry>> {
 	private static final List<String> SUFFIXES = Collections
 			.unmodifiableList(Arrays.asList(".tar.gz", ".tgz")); //$NON-NLS-1$ //$NON-NLS-2$
 
-	private final ArchiveCommand.Format<ArchiveOutputStream> tarFormat = new TarFormat();
+	private final ArchiveCommand.Format<ArchiveOutputStream<TarArchiveEntry>> tarFormat = new TarFormat();
 
 	@Override
 	public ArchiveOutputStream createArchiveOutputStream(OutputStream s)
@@ -57,7 +58,7 @@ public ArchiveOutputStream createArchiveOutputStream(OutputStream s,
 	}
 
 	@Override
-	public void putEntry(ArchiveOutputStream out,
+	public void putEntry(ArchiveOutputStream<TarArchiveEntry> out,
 			ObjectId tree, String path, FileMode mode, ObjectLoader loader)
 			throws IOException {
 		tarFormat.putEntry(out, tree, path, mode, loader);
diff --git a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TxzFormat.java b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TxzFormat.java
index 42549de30..f51f904bc 100644
--- a/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TxzFormat.java
+++ b/org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TxzFormat.java
@@ -17,6 +17,7 @@
 import java.util.Map;
 
 import org.apache.commons.compress.archivers.ArchiveOutputStream;
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.compressors.xz.XZCompressorOutputStream;
 import org.eclipse.jgit.api.ArchiveCommand;
 import org.eclipse.jgit.lib.FileMode;
@@ -26,12 +27,12 @@
 /**
  * Xz-compressed tar (tar.xz) format.
  */
-public final class TxzFormat extends BaseFormat implements
-		ArchiveCommand.Format<ArchiveOutputStream> {
+public final class TxzFormat extends BaseFormat
+		implements ArchiveCommand.Format<ArchiveOutputStream<TarArchiveEntry>> {
 	private static final List<String> SUFFIXES = Collections
 			.unmodifiableList(Arrays.asList(".tar.xz", ".txz")); //$NON-NLS-1$ //$NON-NLS-2$
 
-	private final ArchiveCommand.Format<ArchiveOutputStream> tarFormat = new TarFormat();
+	private final ArchiveCommand.Format<ArchiveOutputStream<TarArchiveEntry>> tarFormat = new TarFormat();
 
 	@Override
 	public ArchiveOutputStream createArchiveOutputStream(OutputStream s)
@@ -54,7 +55,7 @@ public ArchiveOutputStream createArchiveOutputStream(OutputStream s,
 	}
 
 	@Override
-	public void putEntry(ArchiveOutputStream out,
+	public void putEntry(ArchiveOutputStream<TarArchiveEntry> out,
 			ObjectId tree, String path, FileMode mode, ObjectLoader loader)
 			throws IOException {
 		tarFormat.putEntry(out, tree, path, mode, loader);