diff --git a/pisi/configfile.py b/pisi/configfile.py
index 5d01398c..fc83d5de 100644
--- a/pisi/configfile.py
+++ b/pisi/configfile.py
@@ -20,6 +20,7 @@
 #[general]
 #destinationdirectory = /
 #autoclean = False
+#xdelta = False
 #
 #[build]
 #host = i686-pc-linux-gnu
@@ -59,6 +60,7 @@ class GeneralDefaults:
     """Default values for [general] section"""
     destinationdirectory = "/"
     autoclean = False
+    xdelta = False
     distribution = "Pardus"
     distribution_release = "1.1"
     http_proxy = os.getenv("HTTP_PROXY") or None
diff --git a/pisi/package.py b/pisi/package.py
index fffde9d6..233130ea 100644
--- a/pisi/package.py
+++ b/pisi/package.py
@@ -50,7 +50,7 @@ class Package:
 
             # if package is installed (which means we are upgrading it),
             # calculate needed info
-            if ctx.installdb.is_installed(current_pkg): 
+            if ctx.installdb.is_installed(current_pkg) and ctx.config.values.general.xdelta: 
                 installed = True
 
                 # calculate currently installed package's name and pisi file's location
@@ -69,7 +69,7 @@ class Package:
             else:
                 installed = False
                 
-            if installed and exists(current_fn):
+            if installed and exists(current_fn) and ctx.config.values.general.xdelta:
                 # if package is installed and old pisi file exists, fetch xdelta
                 if not exists(xdelta_fn):
                     ctx.ui.info(_("Trying to fetch xdelta: %s") % xdelta_url)