diff --git a/iwla.py b/iwla.py
index e865a7f..6d04cc4 100755
--- a/iwla.py
+++ b/iwla.py
@@ -132,7 +132,7 @@ class IWLA(object):
 
     ANALYSIS_CLASS = 'HTTP'
     API_VERSION = 1
-    IWLA_VERSION = '0.5-dev'
+    IWLA_VERSION = '0.6'
 
     def __init__(self, logLevel, dry_run):
         self.meta_infos = {}
@@ -572,34 +572,33 @@ class IWLA(object):
 
         self.display.addPage(page)
 
-    def _compressFile(self, build_time, root, filename):
+    def _compressFile(self, root, filename):
         path = os.path.join(root, filename)
         gz_path = path + '.gz'
 
         self.logger.debug('Compress %s => %s' % (path, gz_path))
 
         if not os.path.exists(gz_path) or\
-           os.stat(path).st_mtime >= build_time:
+           os.stat(path).st_mtime > os.stat(gz_path).st_mtime:
             if self.dry_run: return
             with open(path, 'rb') as f_in, gzip.open(gz_path, 'wb') as f_out:
                 f_out.write(f_in.read())
 
-    def _compressFiles(self, build_time, root):
+    def _compressFiles(self, root):
         if not conf.compress_output_files: return
         for rootdir, subdirs, files in os.walk(root, followlinks=True):
             for f in files:
                 for ext in conf.compress_output_files:
                     if f.endswith(ext):
-                        self._compressFile(build_time, rootdir, f)
+                        self._compressFile(rootdir, f)
                         break
                         
     def _generateDisplay(self):
         self._generateDisplayDaysStats()
         self._callPlugins(conf.DISPLAY_HOOK_DIRECTORY)
         self._generateDisplayWholeMonthStats()
-        build_time = time.mktime(time.localtime())
         self.display.build(conf.DISPLAY_ROOT)
-        self._compressFiles(build_time, conf.DISPLAY_ROOT)
+        self._compressFiles(conf.DISPLAY_ROOT)
 
     def _createEmptyStats(self):
         stats = {}