diff --git a/pisi/build.py b/pisi/build.py
index 58087f7a..c32a6540 100644
--- a/pisi/build.py
+++ b/pisi/build.py
@@ -243,7 +243,7 @@ class PisiBuild:
 
             # testing
             pkgName = package.name + '-' + self.spec.source.version +\
-                '-' + self.spec.source.release + ".pisi"
+                '-' + self.spec.source.release + const.package_prefix
             
             ui.info("Creating PISI package %s\n" % pkgName)
             
diff --git a/pisi/constants.py b/pisi/constants.py
index fa1f14c2..c9921e2b 100644
--- a/pisi/constants.py
+++ b/pisi/constants.py
@@ -33,6 +33,9 @@ class Constants:
         self.__c.distribution = "Pardus"
         self.__c.distributionRelease = "0.1"
 
+        # prefix for package names
+        self.__c.package_prefix = ".pisi"
+
         # directories
         # TODO: bu dizinler constant olmak zorunda değil. yalnızca bu
         # grubu config içerisine taşıyabiliriz. configfile'dan