Index: logback-core/src/main/java/ch/qos/logback/core/rolling/helper/Compressor.java
===================================================================
--- logback-core/src/main/java/ch/qos/logback/core/rolling/helper/Compressor.java	(revision 37769)
+++ logback-core/src/main/java/ch/qos/logback/core/rolling/helper/Compressor.java	(revision 37815)
@@ -1,8 +1,8 @@
 /**
  * LOGBack: the reliable, fast and flexible logging library for Java.
- * 
+ *
  * Copyright (C) 1999-2006, QOS.ch
- * 
+ *
  * This library is free software, you can redistribute it and/or modify it under
  * the terms of the GNU Lesser General Public License as published by the Free
  * Software Foundation.
@@ -24,7 +24,7 @@
 /**
  * The <code>Compression</code> class implements ZIP and GZ file
  * compression/decompression methods.
- * 
+ *
  * @author Ceki G&uuml;lc&uuml;
  */
 public class Compressor extends ContextAwareBase {
@@ -37,8 +37,8 @@
   public Compressor(CompressionMode compressionMode) {
     this.compressionMode = compressionMode;
   }
-  
-  
+
+
 //  public Compressor(CompressionMode compressionMode, String nameOfFile2Compress, String nameOfCompressedFile) {
 //    this.compressionMode = compressionMode;
 //    //this.nameOfFile2Compress = nameOfFile2Compress;
@@ -47,7 +47,7 @@
 
   public void compress( String nameOfFile2Compress, String nameOfCompressedFile) {
     switch(compressionMode) {
-    case GZ: 
+    case GZ:
       addInfo("GZ compressing [" + nameOfFile2Compress + "].");
       gzCompress(nameOfFile2Compress, nameOfCompressedFile);
       break;
@@ -90,7 +90,7 @@
       ZipOutputStream zos = new ZipOutputStream(fos);
       FileInputStream fis = new FileInputStream(nameOfFile2zip);
 
-      ZipEntry zipEntry = new ZipEntry(file2zip.getName());
+      ZipEntry zipEntry = new ZipEntry(nameOfZippedFile.substring(0, nameOfZippedFile.length() - 4));
       zos.putNextEntry(zipEntry);
 
       byte[] inbuf = new byte[8102];
@@ -159,7 +159,7 @@
           + nameOfFile2gz + "] into [" + nameOfgzedFile + "].", this, e));
     }
   }
-  
+
   @Override
   public String toString() {
     return "c.q.l.core.rolling.helper.Compress";